diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6719b893..85bd2d5f8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 ###Changelog
 
+####Version 0.13.7
+* Pebble: Fix configuration of certain pebble apps (eg. QR Generator, Squared 4.0)
+* Mi Band: allow to delete Mi Band address from development settings
+* Mi Band 2: Some initial hacky support for hr readings (Debug activity only)
+
 ####Version 0.13.6
 * Mi Band 2: Support for multiple alarms (3 at the moment)
 * Mi Band 2: Fix for alarms not working when just one is enabled
diff --git a/app/build.gradle b/app/build.gradle
index dc6725f37..7f9770cd0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -26,8 +26,8 @@ android {
         targetSdkVersion 23
 
         // note: always bump BOTH versionCode and versionName!
-        versionName "0.13.6"
-        versionCode 68
+        versionName "0.13.7"
+        versionCode 69
 
         vectorDrawables.useSupportLibrary = true
     }
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/ExternalPebbleJSActivity.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/ExternalPebbleJSActivity.java
index ed9ed5085..44d5d93a6 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/ExternalPebbleJSActivity.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/ExternalPebbleJSActivity.java
@@ -161,23 +161,22 @@ public class ExternalPebbleJSActivity extends GBActivity {
 
         @JavascriptInterface
         public void sendAppMessage(String msg) {
-            LOG.debug("from WEBVIEW: ", msg);
+            LOG.debug("from WEBVIEW: " + msg);
             JSONObject knownKeys = getAppConfigurationKeys();
 
             try {
                 JSONObject in = new JSONObject(msg);
                 JSONObject out = new JSONObject();
                 String inKey, outKey;
-                boolean passKey = false;
+                boolean passKey;
                 for (Iterator<String> key = in.keys(); key.hasNext(); ) {
                     passKey = false;
                     inKey = key.next();
                     outKey = null;
-                    int pebbleAppIndex = knownKeys.optInt(inKey);
-                    if (pebbleAppIndex != 0) {
+                    int pebbleAppIndex = knownKeys.optInt(inKey, -1);
+                    if (pebbleAppIndex != -1) {
                         passKey = true;
                         outKey = String.valueOf(pebbleAppIndex);
-
                     } else {
                         //do not discard integer keys (see https://developer.pebble.com/guides/communication/using-pebblekit-js/ )
                         Scanner scanner = new Scanner(inKey);
@@ -187,7 +186,7 @@ public class ExternalPebbleJSActivity extends GBActivity {
                         }
                     }
 
-                    if (passKey && outKey != null) {
+                    if (passKey) {
                         Object obj = in.get(inKey);
                         if (obj instanceof Boolean) {
                             obj = ((Boolean) obj) ? "true" : "false";
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleProtocol.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleProtocol.java
index a2a7e73f5..57c58b70d 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleProtocol.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleProtocol.java
@@ -1645,6 +1645,9 @@ public class PebbleProtocol extends GBDeviceProtocol {
             } else if (pair.second instanceof byte[]) {
                 length += ((byte[]) pair.second).length;
             }
+            else {
+                LOG.warn("unknown type: " + pair.second.getClass().toString());
+            }
         }
 
         ByteBuffer buf = ByteBuffer.allocate(LENGTH_PREFIX + length);
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleSupport.java
index a6beb9ffa..dcf14ada3 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleSupport.java
@@ -3,6 +3,7 @@ package nodomain.freeyourgadget.gadgetbridge.service.devices.pebble;
 import android.net.Uri;
 import android.util.Pair;
 
+import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
@@ -59,6 +60,14 @@ public class PebbleSupport extends AbstractSerialDeviceSupport {
             while (keysIterator.hasNext()) {
                 String keyStr = keysIterator.next();
                 Object object = json.get(keyStr);
+                if (object instanceof JSONArray) {
+                    JSONArray jsonArray = (JSONArray) object;
+                    byte[] byteArray = new byte[jsonArray.length()];
+                    for (int i = 0; i < jsonArray.length(); i++) {
+                        byteArray[i] = ((Integer) jsonArray.get(i)).byteValue();
+                    }
+                    object = byteArray;
+                }
                 pairs.add(new Pair<>(Integer.parseInt(keyStr), object));
             }
             getDeviceIOThread().write(((PebbleProtocol) getDeviceProtocol()).encodeApplicationMessagePush(PebbleProtocol.ENDPOINT_APPLICATIONMESSAGE, uuid, pairs));
diff --git a/app/src/main/res/xml/changelog_master.xml b/app/src/main/res/xml/changelog_master.xml
index 6459f6044..f778baba0 100644
--- a/app/src/main/res/xml/changelog_master.xml
+++ b/app/src/main/res/xml/changelog_master.xml
@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <changelog>
+    <release version="0.13.7" versioncode="69">
+        <change>Pebble: Fix configuration of certain pebble apps (eg. QR Generator, Squared 4.0)</change>
+        <change>Mi Band: allow to delete Mi Band address from development settings</change>
+        <change>Mi Band 2: Some initial hacky support for hr readings (Debug activity only)</change>
+    </release>
     <release version="0.13.6" versioncode="68">
         <change>Mi Band 2: Support multiple alarms (3 at the moment)</change>
         <change>Mi Band 2: Fix for alarms not working when just one is enabled</change>