Amazfit GTR 4: Fix and whitelist firmware 3.17.0.2

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/Huami2021Coordinator.java

@@ -16,6 +16,9 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 package nodomain.freeyourgadget.gadgetbridge.devices.huami;
 
+import android.content.Context;
+import android.net.Uri;
+
 import androidx.annotation.NonNull;
 
 import org.apache.commons.lang3.ArrayUtils;
@@ -37,11 +40,15 @@ import nodomain.freeyourgadget.gadgetbridge.entities.Device;
 import nodomain.freeyourgadget.gadgetbridge.entities.HuamiExtendedActivitySampleDao;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.ActivitySummaryParser;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.services.ZeppOsConfigService;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.HuamiLanguageType;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.HuamiVibrationPatternNotificationType;
 
 public abstract class Huami2021Coordinator extends HuamiCoordinator {
+    @Override
+    public abstract AbstractHuami2021FWInstallHandler findInstallHandler(final Uri uri, final Context context);
+
     @Override
     public boolean supportsHeartRateMeasurement(final GBDevice device) {
         return true;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/HuamiFWHelper.java

@@ -28,7 +28,6 @@ import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWHelper;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuamiFirmwareInfo;
-import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.HuamiFirmwareInfo;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.HuamiFirmwareType;
 
 public abstract class HuamiFWHelper extends AbstractMiBandFWHelper {
@@ -124,6 +123,12 @@ public abstract class HuamiFWHelper extends AbstractMiBandFWHelper {
         return firmwareInfo.getFirmwareType();
     }
 
+    @Override
+    public void unsetFwBytes() {
+        super.unsetFwBytes();
+        firmwareInfo.unsetFwBytes();
+    }
+
     public AbstractHuamiFirmwareInfo getFirmwareInfo() {
         return firmwareInfo;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitband7/AmazfitBand7Coordinator.java

@@ -25,11 +25,11 @@ import androidx.annotation.NonNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.Huami2021Coordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiConst;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDeviceCandidate;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
 public class AmazfitBand7Coordinator extends Huami2021Coordinator {
     private static final Logger LOG = LoggerFactory.getLogger(AmazfitBand7Coordinator.class);
@@ -56,7 +56,7 @@ public class AmazfitBand7Coordinator extends Huami2021Coordinator {
     }
 
     @Override
-    public InstallHandler findInstallHandler(final Uri uri, final Context context) {
+    public AbstractHuami2021FWInstallHandler findInstallHandler(final Uri uri, final Context context) {
         final AmazfitBand7FWInstallHandler handler = new AmazfitBand7FWInstallHandler(uri, context);
         return handler.isValid() ? handler : null;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitband7/AmazfitBand7FWInstallHandler.java

@@ -23,11 +23,11 @@ import java.io.IOException;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWHelper;
-import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWInstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
-class AmazfitBand7FWInstallHandler extends AbstractMiBandFWInstallHandler {
+class AmazfitBand7FWInstallHandler extends AbstractHuami2021FWInstallHandler {
     AmazfitBand7FWInstallHandler(final Uri uri, final Context context) {
         super(uri, context);
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitgtr3/AmazfitGTR3Coordinator.java

@@ -25,11 +25,11 @@ import androidx.annotation.NonNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.Huami2021Coordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiConst;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDeviceCandidate;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
 public class AmazfitGTR3Coordinator extends Huami2021Coordinator {
     private static final Logger LOG = LoggerFactory.getLogger(AmazfitGTR3Coordinator.class);
@@ -56,7 +56,7 @@ public class AmazfitGTR3Coordinator extends Huami2021Coordinator {
     }
 
     @Override
-    public InstallHandler findInstallHandler(final Uri uri, final Context context) {
+    public AbstractHuami2021FWInstallHandler findInstallHandler(final Uri uri, final Context context) {
         final AmazfitGTR3FWInstallHandler handler = new AmazfitGTR3FWInstallHandler(uri, context);
         return handler.isValid() ? handler : null;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitgtr3/AmazfitGTR3FWInstallHandler.java

@@ -23,11 +23,11 @@ import java.io.IOException;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWHelper;
-import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWInstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
-class AmazfitGTR3FWInstallHandler extends AbstractMiBandFWInstallHandler {
+class AmazfitGTR3FWInstallHandler extends AbstractHuami2021FWInstallHandler {
     AmazfitGTR3FWInstallHandler(Uri uri, Context context) {
         super(uri, context);
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitgtr4/AmazfitGTR4Coordinator.java

@@ -30,6 +30,7 @@ import nodomain.freeyourgadget.gadgetbridge.devices.huami.Huami2021Coordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiConst;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDeviceCandidate;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
 public class AmazfitGTR4Coordinator extends Huami2021Coordinator {
     private static final Logger LOG = LoggerFactory.getLogger(AmazfitGTR4Coordinator.class);
@@ -56,7 +57,7 @@ public class AmazfitGTR4Coordinator extends Huami2021Coordinator {
     }
 
     @Override
-    public InstallHandler findInstallHandler(final Uri uri, final Context context) {
+    public AbstractHuami2021FWInstallHandler findInstallHandler(final Uri uri, final Context context) {
         final AmazfitGTR4FWInstallHandler handler = new AmazfitGTR4FWInstallHandler(uri, context);
         return handler.isValid() ? handler : null;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitgtr4/AmazfitGTR4FWInstallHandler.java

@@ -23,11 +23,11 @@ import java.io.IOException;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWHelper;
-import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWInstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
-class AmazfitGTR4FWInstallHandler extends AbstractMiBandFWInstallHandler {
+class AmazfitGTR4FWInstallHandler extends AbstractHuami2021FWInstallHandler {
     AmazfitGTR4FWInstallHandler(final Uri uri, final Context context) {
         super(uri, context);
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitgts3/AmazfitGTS3Coordinator.java

@@ -25,11 +25,11 @@ import androidx.annotation.NonNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.Huami2021Coordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiConst;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDeviceCandidate;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
 public class AmazfitGTS3Coordinator extends Huami2021Coordinator {
     private static final Logger LOG = LoggerFactory.getLogger(AmazfitGTS3Coordinator.class);
@@ -56,7 +56,7 @@ public class AmazfitGTS3Coordinator extends Huami2021Coordinator {
     }
 
     @Override
-    public InstallHandler findInstallHandler(final Uri uri, final Context context) {
+    public AbstractHuami2021FWInstallHandler findInstallHandler(final Uri uri, final Context context) {
         final AmazfitGTS3FWInstallHandler handler = new AmazfitGTS3FWInstallHandler(uri, context);
         return handler.isValid() ? handler : null;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitgts3/AmazfitGTS3FWInstallHandler.java

@@ -23,11 +23,11 @@ import java.io.IOException;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWHelper;
-import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWInstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
-class AmazfitGTS3FWInstallHandler extends AbstractMiBandFWInstallHandler {
+class AmazfitGTS3FWInstallHandler extends AbstractHuami2021FWInstallHandler {
     AmazfitGTS3FWInstallHandler(Uri uri, Context context) {
         super(uri, context);
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitgts4/AmazfitGTS4Coordinator.java

@@ -25,11 +25,11 @@ import androidx.annotation.NonNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.Huami2021Coordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiConst;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDeviceCandidate;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
 public class AmazfitGTS4Coordinator extends Huami2021Coordinator {
     private static final Logger LOG = LoggerFactory.getLogger(AmazfitGTS4Coordinator.class);
@@ -56,7 +56,7 @@ public class AmazfitGTS4Coordinator extends Huami2021Coordinator {
     }
 
     @Override
-    public InstallHandler findInstallHandler(final Uri uri, final Context context) {
+    public AbstractHuami2021FWInstallHandler findInstallHandler(final Uri uri, final Context context) {
         final AmazfitGTS4FWInstallHandler handler = new AmazfitGTS4FWInstallHandler(uri, context);
         return handler.isValid() ? handler : null;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/amazfitgts4/AmazfitGTS4FWInstallHandler.java

@@ -23,11 +23,11 @@ import java.io.IOException;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWHelper;
-import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWInstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
-class AmazfitGTS4FWInstallHandler extends AbstractMiBandFWInstallHandler {
+class AmazfitGTS4FWInstallHandler extends AbstractHuami2021FWInstallHandler {
     AmazfitGTS4FWInstallHandler(final Uri uri, final Context context) {
         super(uri, context);
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/miband7/MiBand7Coordinator.java

@@ -25,11 +25,11 @@ import androidx.annotation.NonNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.Huami2021Coordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiConst;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDeviceCandidate;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
 public class MiBand7Coordinator extends Huami2021Coordinator {
     private static final Logger LOG = LoggerFactory.getLogger(MiBand7Coordinator.class);
@@ -56,7 +56,7 @@ public class MiBand7Coordinator extends Huami2021Coordinator {
     }
 
     @Override
-    public InstallHandler findInstallHandler(final Uri uri, final Context context) {
+    public AbstractHuami2021FWInstallHandler findInstallHandler(final Uri uri, final Context context) {
         final MiBand7FWInstallHandler handler = new MiBand7FWInstallHandler(uri, context);
         return handler.isValid() ? handler : null;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/miband7/MiBand7FWInstallHandler.java

@@ -23,11 +23,11 @@ import java.io.IOException;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWHelper;
-import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWInstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.AbstractHuami2021FWInstallHandler;
 
-class MiBand7FWInstallHandler extends AbstractMiBandFWInstallHandler {
+class MiBand7FWInstallHandler extends AbstractHuami2021FWInstallHandler {
     MiBand7FWInstallHandler(Uri uri, Context context) {
         super(uri, context);
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/miband/AbstractMiBandFWHelper.java

@@ -43,8 +43,7 @@ import nodomain.freeyourgadget.gadgetbridge.util.UriHelper;
 public abstract class AbstractMiBandFWHelper {
     private static final Logger LOG = LoggerFactory.getLogger(AbstractMiBandFWHelper.class);
 
-    @NonNull
+    private byte[] fw;
-    private final byte[] fw;
 
     public AbstractMiBandFWHelper(Uri uri, Context context) throws IOException {
         UriHelper uriHelper = UriHelper.get(uri, context);
@@ -104,9 +103,17 @@ public abstract class AbstractMiBandFWHelper {
 
     @NonNull
     public byte[] getFw() {
+        if (fw == null) {
+            throw new IllegalStateException("fw is null");
+        }
+
         return fw;
     }
 
+    public void unsetFwBytes() {
+        this.fw = null;
+    }
+
     public boolean isFirmwareWhitelisted() {
         for (int wlf : getWhitelistedFirmwareVersions()) {
             if (wlf == getFirmwareVersion()) {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/AbstractHuami2021FWInstallHandler.java

@@ -0,0 +1,37 @@
+/*  Copyright (C) 2022 José Rebelo
+
+    This file is part of Gadgetbridge.
+
+    Gadgetbridge is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Gadgetbridge is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+package nodomain.freeyourgadget.gadgetbridge.service.devices.huami;
+
+import android.content.Context;
+import android.net.Uri;
+
+import nodomain.freeyourgadget.gadgetbridge.devices.miband.AbstractMiBandFWInstallHandler;
+import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
+
+public abstract class AbstractHuami2021FWInstallHandler extends AbstractMiBandFWInstallHandler {
+    public AbstractHuami2021FWInstallHandler(final Uri uri, final Context context) {
+        super(uri, context);
+    }
+
+    @Override
+    public void onStartInstall(GBDevice device) {
+        // Unset the firmware bytes
+        // Huami2021 firmwares are large (> 130MB). With the current architecture, the update operation
+        // will re-read them to memory, and we run out-of-memory.
+        helper.unsetFwBytes();
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/AbstractHuamiFirmwareInfo.java

@@ -26,7 +26,7 @@ import nodomain.freeyourgadget.gadgetbridge.util.ArrayUtils;
 import nodomain.freeyourgadget.gadgetbridge.util.CheckSums;
 
 public abstract class AbstractHuamiFirmwareInfo {
-    private final byte[] bytes;
+    private byte[] bytes;
 
     private final int crc16;
     private final int crc32;
@@ -78,6 +78,10 @@ public abstract class AbstractHuamiFirmwareInfo {
         return firmwareType;
     }
 
+    public void unsetFwBytes() {
+        this.bytes = null;
+    }
+
     public abstract String toVersion(int crc16);
 
     public abstract boolean isGenerallyCompatibleWith(GBDevice device);

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/Huami2021FirmwareInfo.java

@@ -28,15 +28,18 @@ import java.util.Arrays;
 
 import nodomain.freeyourgadget.gadgetbridge.service.btle.BLETypeConversions;
 import nodomain.freeyourgadget.gadgetbridge.util.ArrayUtils;
-import nodomain.freeyourgadget.gadgetbridge.util.GB;
 import nodomain.freeyourgadget.gadgetbridge.util.ZipFile;
+import nodomain.freeyourgadget.gadgetbridge.util.ZipFileException;
 
 
 public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
     private static final Logger LOG = LoggerFactory.getLogger(Huami2021FirmwareInfo.class);
 
+    private final String preComputedVersion;
+
     public Huami2021FirmwareInfo(final byte[] bytes) {
         super(bytes);
+        this.preComputedVersion = preComputeVersion();
     }
 
     /**
@@ -44,11 +47,6 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
      */
     public abstract String deviceName();
 
-    /**
-     * The expected firmware header bytes, to search on firmware.bin in order to determine compatibility.
-     */
-    public abstract byte[] getExpectedFirmwareHeader();
-
     @Override
     protected HuamiFirmwareType determineFirmwareType(final byte[] bytes) {
         if (ArrayUtils.equals(bytes, UIHHContainer.UIHH_HEADER, 0)) {
@@ -83,7 +81,14 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
         }
 
         if (uihhFirmwareZipFile != null && hasChangelog) {
-            byte[] firmwareBin = ZipFile.tryReadFileQuick(uihhFirmwareZipFile.getContent(), "META/firmware.bin");
+            final ZipFile zipFile = new ZipFile(uihhFirmwareZipFile.getContent());
+            final byte[] firmwareBin;
+            try {
+                firmwareBin = zipFile.getFileFromZip("META/firmware.bin");
+            } catch (final ZipFileException e) {
+                LOG.error("Failed to read zip from UIHH", e);
+                return HuamiFirmwareType.INVALID;
+            }
 
             if (isCompatibleFirmwareBin(firmwareBin)) {
                 return HuamiFirmwareType.FIRMWARE_UIHH_2021_ZIP_WITH_CHANGELOG;
@@ -94,12 +99,32 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
     }
 
     private HuamiFirmwareType handleZipPackage(byte[] bytes) {
-        final byte[] firmwareBin = ZipFile.tryReadFileQuick(bytes, "META/firmware.bin");
+        final ZipFile zipFile = new ZipFile(bytes);
+        final byte[] firmwareBin;
+        try {
+            firmwareBin = zipFile.getFileFromZip("META/firmware.bin");
+        } catch (final ZipFileException e) {
+            LOG.error("Failed to get firmware.bin from zip file", e);
+            return HuamiFirmwareType.FIRMWARE;
+        }
+
         if (isCompatibleFirmwareBin(firmwareBin)) {
             return HuamiFirmwareType.FIRMWARE;
         }
 
-        final String appType = getAppType();
+        final JSONObject appJson = getAppJson(zipFile);
+        if (appJson == null) {
+            return HuamiFirmwareType.INVALID;
+        }
+
+        final String appType;
+        try {
+            appType = appJson.getJSONObject("app").getString("appType");
+        } catch (final Exception e) {
+            LOG.error("Failed to get appType from app.json", e);
+            return HuamiFirmwareType.INVALID;
+        }
+
         switch (appType) {
             case "watchface":
                 return HuamiFirmwareType.WATCHFACE;
@@ -119,6 +144,11 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
             return crcMapVersion;
         }
 
+        return preComputedVersion;
+    }
+
+    public String preComputeVersion() {
+        try {
             switch (firmwareType) {
                 case FIRMWARE_UIHH_2021_ZIP_WITH_CHANGELOG:
                     final UIHHContainer uihh = UIHHContainer.fromRawBytes(getBytes());
@@ -129,18 +159,21 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
                 case FIRMWARE:
                     return getFirmwareVersion(getBytes());
                 case WATCHFACE:
-                final String watchfaceName = getAppName();
+                    final String watchfaceName = getAppName(new ZipFile(getBytes()));
                     if (watchfaceName == null) {
                         return "(unknown watchface)";
                     }
                     return String.format("%s (watchface)", watchfaceName);
                 case APP:
-                final String appName = getAppName();
+                    final String appName = getAppName(new ZipFile(getBytes()));
                     if (appName == null) {
                         return "(unknown app)";
                     }
                     return String.format("%s (app)", appName);
             }
+        } catch (final Exception e) {
+            LOG.error("Failed to pre compute version", e);
+        }
 
         return null;
     }
@@ -150,7 +183,7 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
             throw new IllegalStateException("Can only repack FIRMWARE");
         }
 
-        final UIHHContainer uihh = packFirmwareInUIHH();
+        final UIHHContainer uihh = packFirmwareInUIHH(getBytes());
 
         try {
             final Constructor<? extends Huami2021FirmwareInfo> constructor = this.getClass().getConstructor(byte[].class);
@@ -160,7 +193,7 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
         }
     }
 
-    private UIHHContainer packFirmwareInUIHH() {
+    private static UIHHContainer packFirmwareInUIHH(final byte[] zipBytes) {
         final UIHHContainer uihh = new UIHHContainer();
         final byte[] timestampBytes = BLETypeConversions.fromUint32((int) (System.currentTimeMillis() / 1000L));
         final String changelogText = "Unknown changelog";
@@ -168,23 +201,18 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
                 timestampBytes,
                 changelogText.getBytes(StandardCharsets.UTF_8)
         );
-        uihh.addFile(UIHHContainer.FileType.FIRMWARE_ZIP, getBytes());
+        uihh.addFile(UIHHContainer.FileType.FIRMWARE_ZIP, zipBytes);
         uihh.addFile(UIHHContainer.FileType.FIRMWARE_CHANGELOG, changelogBytes);
         return uihh;
     }
 
     private boolean isCompatibleFirmwareBin(final byte[] firmwareBin) {
         if (firmwareBin == null) {
+            LOG.error("firmware bin is null");
             return false;
         }
 
-        if (!ArrayUtils.equals(firmwareBin, getExpectedFirmwareHeader(), 0)) {
+        if (!searchString(firmwareBin, deviceName())) {
-            LOG.warn("Unexpected firmware header: {}", GB.hexdump(Arrays.copyOfRange(firmwareBin, 0, getExpectedFirmwareHeader().length + 3)));
-            return false;
-        }
-
-        // On the MB7, this only works for firmwares > 1.8.5.1, not for any older firmware
-        if (!searchString32BitAligned(firmwareBin, deviceName() + "\0")) {
             LOG.warn("Failed to find {} in fwBytes", deviceName());
             return false;
         }
@@ -192,11 +220,13 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
         return true;
     }
 
-    public String getFirmwareVersion(final byte[] fwbytes) {
+    public static String getFirmwareVersion(final byte[] fwBytes) {
-        final byte[] firmwareBin = ZipFile.tryReadFileQuick(fwbytes, "META/firmware.bin");
+        final ZipFile zipFile = new ZipFile(fwBytes);
-
+        final byte[] firmwareBin;
-        if (firmwareBin == null) {
+        try {
-            LOG.warn("Failed to read firmware.bin");
+            firmwareBin = zipFile.getFileFromZip("META/firmware.bin");
+        } catch (final ZipFileException e) {
+            LOG.error("Failed to get firmware.bin from zip", e);
             return null;
         }
 
@@ -225,34 +255,30 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
         return new String(Arrays.copyOfRange(firmwareBin, startIdx, endIdx));
     }
 
-    public String getAppName() {
+    public String getAppName(final ZipFile zipFile) {
-        final byte[] appJsonBin = ZipFile.tryReadFileQuick(getBytes(), "app.json");
-        if (appJsonBin == null) {
-            LOG.warn("Failed to get app.json from zip");
-            return null;
-        }
-
-        try {
-            final String appJsonString = new String(appJsonBin, StandardCharsets.UTF_8)
-                    // Remove UTF-8 BOM if present
-                    .replace("\uFEFF", "");
-            final JSONObject jsonObject = new JSONObject(appJsonString);
         // TODO check i18n section?
         // TODO Show preview icon?
-            final String appName = jsonObject.getJSONObject("app").getString("appName");
 
-            return String.format("%s", appName);
+        final JSONObject appJson = getAppJson(zipFile);
+        if (appJson == null) {
+            return null;
+        }
+
+        try {
+            return appJson.getJSONObject("app").getString("appName");
         } catch (final Exception e) {
-            LOG.error("Failed to parse app.json", e);
+            LOG.error("Failed to get appName from app.json", e);
         }
 
         return null;
     }
 
-    public String getAppType() {
+    private static JSONObject getAppJson(final ZipFile zipFile) {
-        final byte[] appJsonBin = ZipFile.tryReadFileQuick(getBytes(), "app.json");
+        final byte[] appJsonBin;
-        if (appJsonBin == null) {
+        try {
-            LOG.warn("Failed to get app.json from zip");
+            appJsonBin = zipFile.getFileFromZip("app.json");
+        } catch (final ZipFileException e) {
+            LOG.error("Failed to read app.json", e);
             return null;
         }
 
@@ -260,12 +286,30 @@ public abstract class Huami2021FirmwareInfo extends AbstractHuamiFirmwareInfo {
             final String appJsonString = new String(appJsonBin, StandardCharsets.UTF_8)
                     // Remove UTF-8 BOM if present
                     .replace("\uFEFF", "");
-            final JSONObject jsonObject = new JSONObject(appJsonString);
+            return new JSONObject(appJsonString);
-            return jsonObject.getJSONObject("app").getString("appType");
         } catch (final Exception e) {
             LOG.error("Failed to parse app.json", e);
         }
 
         return null;
     }
+
+    public static boolean searchString(final byte[] fwBytes, final String str) {
+        final byte[] strBytes = (str + "\0").getBytes(StandardCharsets.UTF_8);
+
+        for (int i = 0; i < fwBytes.length - strBytes.length + 1; i++) {
+            boolean found = true;
+            for (int j = 0; j < strBytes.length; j++) {
+                if (fwBytes[i + j] != strBytes[j]) {
+                    found = false;
+                    break;
+                }
+            }
+            if (found) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/amazfitband7/AmazfitBand7FirmwareInfo.java

@@ -37,11 +37,6 @@ public class AmazfitBand7FirmwareInfo extends Huami2021FirmwareInfo {
         return HuamiConst.AMAZFIT_BAND7_NAME;
     }
 
-    @Override
-    public byte[] getExpectedFirmwareHeader() {
-        return new byte[]{0x51, 0x71};
-    }
-
     @Override
     public boolean isGenerallyCompatibleWith(final GBDevice device) {
         return isHeaderValid() && device.getType() == DeviceType.AMAZFITBAND7;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/amazfitgtr3/AmazfitGTR3FirmwareInfo.java

@@ -43,11 +43,6 @@ public class AmazfitGTR3FirmwareInfo extends Huami2021FirmwareInfo {
         return HuamiConst.AMAZFIT_GTR3_NAME;
     }
 
-    @Override
-    public byte[] getExpectedFirmwareHeader() {
-        return new byte[]{0x00, 0x00, 0x50}; // Probably bogus, only checked against 2 firmware files
-    }
-
     @Override
     public boolean isGenerallyCompatibleWith(final GBDevice device) {
         return isHeaderValid() && device.getType() == DeviceType.AMAZFITGTR3;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/amazfitgtr4/AmazfitGTR4FirmwareInfo.java

@@ -27,6 +27,7 @@ import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.Huami2021Firmw
 public class AmazfitGTR4FirmwareInfo extends Huami2021FirmwareInfo {
     private static final Map<Integer, String> crcToVersion = new HashMap<Integer, String>() {{
         // firmware
+        put(1699, "3.17.0.2");
     }};
 
     public AmazfitGTR4FirmwareInfo(final byte[] bytes) {
@@ -38,11 +39,6 @@ public class AmazfitGTR4FirmwareInfo extends Huami2021FirmwareInfo {
         return HuamiConst.AMAZFIT_GTR4_NAME;
     }
 
-    @Override
-    public byte[] getExpectedFirmwareHeader() {
-        return new byte[]{(byte) 0x51, (byte) 0x71, (byte) 0x9c}; // Probably bogus, only checked against 1 firmware files
-    }
-
     @Override
     public boolean isGenerallyCompatibleWith(final GBDevice device) {
         return isHeaderValid() && device.getType() == DeviceType.AMAZFITGTR4;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/amazfitgts3/AmazfitGTS3FirmwareInfo.java

@@ -43,11 +43,6 @@ public class AmazfitGTS3FirmwareInfo extends Huami2021FirmwareInfo {
         return HuamiConst.AMAZFIT_GTS3_NAME;
     }
 
-    @Override
-    public byte[] getExpectedFirmwareHeader() {
-        return new byte[]{0x00, 0x00, 0x50}; // Probably bogus, only checked against 2 firmware files
-    }
-
     @Override
     public boolean isGenerallyCompatibleWith(final GBDevice device) {
         return isHeaderValid() && device.getType() == DeviceType.AMAZFITGTS3;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/amazfitgts4/AmazfitGTS4FirmwareInfo.java

@@ -38,11 +38,6 @@ public class AmazfitGTS4FirmwareInfo extends Huami2021FirmwareInfo {
         return HuamiConst.AMAZFIT_GTS4_NAME;
     }
 
-    @Override
-    public byte[] getExpectedFirmwareHeader() {
-        return new byte[]{(byte) 0x51, (byte) 0x71, (byte) 0x9c}; // Probably bogus, only checked against 1 firmware files
-    }
-
     @Override
     public boolean isGenerallyCompatibleWith(final GBDevice device) {
         return isHeaderValid() && device.getType() == DeviceType.AMAZFITGTS4;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/miband7/MiBand7FirmwareInfo.java

@@ -43,11 +43,6 @@ public class MiBand7FirmwareInfo extends Huami2021FirmwareInfo {
         return HuamiConst.XIAOMI_SMART_BAND7_NAME;
     }
 
-    @Override
-    public byte[] getExpectedFirmwareHeader() {
-        return new byte[]{0x51, 0x71};
-    }
-
     @Override
     public boolean isGenerallyCompatibleWith(final GBDevice device) {
         return isHeaderValid() && device.getType() == DeviceType.MIBAND7;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/ZipFile.java

@@ -79,28 +79,6 @@ public class ZipFile {
         }
     }
 
-    /**
-     * Tries to obtain file from ZIP file without much hassle, but is not safe.<br>
-     * Please only use this in place of old code where correctness of the result is checked only later on.<br>
-     * Use getFileFromZip of ZipFile instance instead.
-     * @param zipBytes
-     * @param path Path of the file in the ZIP file.
-     * @return Contents of requested file or null.
-     */
-    @Deprecated
-    @Nullable
-    public static byte[] tryReadFileQuick(final byte[] zipBytes, final String path) {
-        try {
-            return new ZipFile(zipBytes).getFileFromZip(path);
-        } catch (ZipFileException e) {
-            LOG.error("Quick ZIP reading failed.", e);
-        } catch (Exception e) {
-            LOG.error("Unable to close ZipFile.", e);
-        }
-
-        return null;
-    }
-
     private static byte[] readAllBytes(final InputStream is) throws IOException {
         final ByteArrayOutputStream buffer = new ByteArrayOutputStream();