diff --git a/bot.php b/bot.php
index da36f28c..e684be8a 100755
--- a/bot.php
+++ b/bot.php
@@ -13,7 +13,7 @@ If not, see <http://www.gnu.org/licenses/>.
 set_include_path(get_include_path().':'.realpath(dirname(__FILE__).'/MadelineProto/'));
 
 require 'vendor/autoload.php';
-$settings = ['app_info' => ['api_id' => 6, 'api_hash' => 'eb06d4abfb49dc3eeb1aeb98ae0f581e']]; //, 'connection_settings' => ['all' => ['test_mode' => true]]];
+$settings = ['app_info' => ['api_id' => 6, 'api_hash' => 'eb06d4abfb49dc3eeb1aeb98ae0f581e']];//, 'connection_settings' => ['all' => ['test_mode' => true]]];
 
 try {
     $MadelineProto = new \danog\MadelineProto\API('bot.madeline');
@@ -37,7 +37,7 @@ while (true) {
             case 'updateNewMessage':
             case 'updateNewChannelMessage':
                 if (isset($update['update']['message']['out']) && $update['update']['message']['out']) {
-                    continue;
+//                    continue;
                 }
                 $res = json_encode($update, JSON_PRETTY_PRINT);
                 if ($res == '') {
@@ -45,16 +45,16 @@ while (true) {
                 }
 
                 try {
-                    $MadelineProto->messages->sendMessage(['peer' => $update['update']['_'] === 'updateNewMessage' ? $update['update']['message']['from_id'] : $update['update']['message']['to_id'], 'message' => $res, 'reply_to_msg_id' => $update['update']['message']['id'], 'entities' => [['_' => 'messageEntityPre', 'offset' => 0, 'length' => strlen($res), 'language' => 'json']]]);
+//                    $MadelineProto->messages->sendMessage(['peer' => $update['update']['_'] === 'updateNewMessage' ? $update['update']['message']['from_id'] : $update['update']['message']['to_id'], 'message' => $res, 'reply_to_msg_id' => $update['update']['message']['id'], 'entities' => [['_' => 'messageEntityPre', 'offset' => 0, 'length' => strlen($res), 'language' => 'json']]]);
                 } catch (\danog\MadelineProto\RPCErrorException $e) {
                     $MadelineProto->messages->sendMessage(['peer' => '@danogentili', 'message' => $e->getCode().': '.$e->getMessage().PHP_EOL.$e->getTraceAsString()]);
                 }
 
                 try {
                     if (isset($update['update']['message']['media']) && ($update['update']['message']['media']['_'] == 'messageMediaPhoto' || $update['update']['message']['media']['_'] == 'messageMediaDocument')) {
-                        $time = time();
+                        $time = microtime(true);
                         $file = $MadelineProto->download_to_dir($update['update']['message']['media'], '/tmp');
-                        $MadelineProto->messages->sendMessage(['peer' => isset($update['update']['message']['from_id']) ? $update['update']['message']['from_id'] : $update['update']['message']['to_id'], 'message' => 'Downloaded to '.$file.' in '.(time() - $time).' seconds', 'reply_to_msg_id' => $update['update']['message']['id'], 'entities' => [['_' => 'messageEntityPre', 'offset' => 0, 'length' => strlen($res), 'language' => 'json']]]);
+                        $MadelineProto->messages->sendMessage(['peer' => isset($update['update']['message']['from_id']) ? $update['update']['message']['from_id'] : $update['update']['message']['to_id'], 'message' => 'Downloaded to '.$file.' in '.(microtime(true) - $time).' seconds', 'reply_to_msg_id' => $update['update']['message']['id'], 'entities' => [['_' => 'messageEntityPre', 'offset' => 0, 'length' => strlen($res), 'language' => 'json']]]);
                     }
                 } catch (\danog\MadelineProto\RPCErrorException $e) {
                     $MadelineProto->messages->sendMessage(['peer' => '@danogentili', 'message' => $e->getCode().': '.$e->getMessage().PHP_EOL.$e->getTraceAsString()]);
diff --git a/secret_bot.php b/secret_bot.php
index 817b15a3..f86574cf 100755
--- a/secret_bot.php
+++ b/secret_bot.php
@@ -54,27 +54,22 @@ if ($MadelineProto === false) {
             \danog\MadelineProto\Logger::log(['Registering new user'], \danog\MadelineProto\Logger::NOTICE);
             $authorization = $MadelineProto->complete_signup(readline('Please enter your first name: '), readline('Please enter your last name (can be empty): '));
         }
-
-        echo 'Serializing MadelineProto to s.madeline...'.PHP_EOL;
-        echo 'Wrote '.\danog\MadelineProto\Serialization::serialize('s.madeline', $MadelineProto).' bytes'.PHP_EOL;
     } else {
         $MadelineProto->bot_login(getenv('BOT_TOKEN'));
     }
 }
 $message = (getenv('TRAVIS_COMMIT') == '') ? 'I iz works always (io laborare sembre) (yo lavorar siempre) (mi labori ĉiam) (я всегда работать) (Ik werkuh altijd) (Ngimbonga ngaso sonke isikhathi ukusebenza)' : ('Travis ci tests in progress: commit '.getenv('TRAVIS_COMMIT').', job '.getenv('TRAVIS_JOB_NUMBER').', PHP version: '.getenv('TRAVIS_PHP_VERSION'));
 
-echo 'Serializing MadelineProto to s.madeline...'.PHP_EOL;
-echo 'Wrote '.\danog\MadelineProto\Serialization::serialize('s.madeline', $MadelineProto).' bytes'.PHP_EOL;
+$MadelineProto->session = 's.madeline';
 
 $sent = [-440592694 => true];
 
 $offset = 0;
 while (true) {
     try {
-        $updates = $MadelineProto->API->get_updates(['offset' => $offset, 'limit' => 50, 'timeout' => 0]); // Just like in the bot API, you can specify an offset, a limit and a timeout
+        $updates = $MadelineProto->get_updates(['offset' => $offset, 'limit' => 50, 'timeout' => 0]); // Just like in the bot API, you can specify an offset, a limit and a timeout
         //\danog\MadelineProto\Logger::log([$updates]);
         foreach ($updates as $update) {
-            echo 'Wrote '.\danog\MadelineProto\Serialization::serialize('s.madeline', $MadelineProto).' bytes'.PHP_EOL;
             $offset = $update['update_id'] + 1; // Just like in the bot API, the offset must be set to the last update_id
             switch ($update['update']['_']) {
                 /*case 'updateNewChannelMessage':
@@ -87,11 +82,11 @@ while (true) {
                     }
                     break;*/
                 case 'updateNewEncryptedMessage':
-                    //var_dump($MadelineProto->download_to_dir($update['update']['message'], '.'));
+                    var_dump($MadelineProto->download_to_dir($update['update']['message'], '.'));
                     if (isset($sent[$update['update']['message']['chat_id']])) {
                         continue;
                     }
-$secret = $update['update']['message']['chat_id'];
+    $secret = $update['update']['message']['chat_id'];
     $secret_media = [];
 
     // Photo uploaded as document, secret chat
@@ -133,7 +128,6 @@ $secret = $update['update']['message']['chat_id'];
                     while ($i < $argv[1]) {
                         echo "SENDING MESSAGE $i TO ".$update['update']['message']['chat_id'].PHP_EOL;
                         $MadelineProto->messages->sendEncrypted(['peer' => $update['update']['message']['chat_id'], 'message' => ['_' => 'decryptedMessage', 'ttl' => 0, 'message' => (string) ($i++)]]);
-                        \danog\MadelineProto\Serialization::serialize('s.madeline', $MadelineProto);
                     }
                     $sent[$update['update']['message']['chat_id']] = true;
            }
@@ -144,5 +138,4 @@ $secret = $update['update']['message']['chat_id'];
         var_dump($e->getMessage());
     }
     //sleep(1);
-    echo 'Wrote '.\danog\MadelineProto\Serialization::serialize('s.madeline', $MadelineProto).' bytes'.PHP_EOL;
 }
diff --git a/src/Socket.php b/src/Socket.php
index bdbe0fcc..dee834d1 100644
--- a/src/Socket.php
+++ b/src/Socket.php
@@ -45,7 +45,6 @@ if (!extension_loaded('pthreads')) {
         {
             if (in_array($name, [\SO_RCVTIMEO, \SO_SNDTIMEO])) {
                 $this->timeout = ['sec' => (int) $value, 'usec' => (int) (($value - (int) $value) * 1000000)];
-                stream_set_timeout($this->sock, $this->timeout['sec'], $this->timeout['usec']);
 
                 return true;
             }
@@ -83,8 +82,10 @@ if (!extension_loaded('pthreads')) {
             if ($this->domain === AF_INET6 && strpos($address, ':') !== false) {
                 $address = '['.$address.']';
             }
-
-            $this->sock = fsockopen($this->protocol.'://'.$address, $port);
+            $errno = 0;
+            $errstr = '';
+            $this->sock = fsockopen($this->protocol.'://'.$address, $port, $errno, $errstr, $this->timeout['sec'] + ($this->timeout['usec']/1000000));
+            stream_set_timeout($this->sock, $this->timeout['sec'], $this->timeout['usec']);
 
             return true;
         }
diff --git a/src/danog/MadelineProto/Connection.php b/src/danog/MadelineProto/Connection.php
index 8236bfd9..e91f3e92 100644
--- a/src/danog/MadelineProto/Connection.php
+++ b/src/danog/MadelineProto/Connection.php
@@ -51,7 +51,6 @@ class Connection
 
     public function __magic_construct($proxy, $extra, $ip, $port, $protocol, $timeout, $ipv6)
     {
-
         // Can use:
         /*
         - tcp_full
@@ -77,11 +76,11 @@ class Connection
                 if ($has_proxy && $this->extra !== []) {
                     $this->sock->setExtra($this->extra);
                 }
+                $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
+                $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
                 if (!$this->sock->connect($ip, $port)) {
                     throw new Exception(\danog\MadelineProto\Lang::$current_lang['socket_con_error']);
                 }
-                $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
-                $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
                 $this->sock->setBlocking(true);
                 $this->write(chr(239));
                 break;
@@ -90,11 +89,11 @@ class Connection
                 if ($has_proxy && $this->extra !== []) {
                     $this->sock->setExtra($this->extra);
                 }
+                $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
+                $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
                 if (!$this->sock->connect($ip, $port)) {
                     throw new Exception(\danog\MadelineProto\Lang::$current_lang['socket_con_error']);
                 }
-                $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
-                $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
                 $this->sock->setBlocking(true);
                 $this->write(str_repeat(chr(238), 4));
                 break;
@@ -104,11 +103,11 @@ class Connection
                 if ($has_proxy && $this->extra !== []) {
                     $this->sock->setExtra($this->extra);
                 }
+                $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
+                $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
                 if (!$this->sock->connect($ip, $port)) {
                     throw new Exception(\danog\MadelineProto\Lang::$current_lang['socket_con_error']);
                 }
-                $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
-                $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
                 $this->sock->setBlocking(true);
 
                 $this->out_seq_no = -1;
@@ -119,11 +118,11 @@ class Connection
                 if ($has_proxy && $this->extra !== []) {
                     $this->sock->setExtra($this->extra);
                 }
+                $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
+                $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
                 if (!$this->sock->connect($ip, $port)) {
                     throw new Exception(\danog\MadelineProto\Lang::$current_lang['socket_con_error']);
                 }
-                $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
-                $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
                 $this->sock->setBlocking(true);
                 do {
                     $random = $this->random(64);
@@ -166,13 +165,11 @@ class Connection
                 if ($has_proxy && $this->extra !== []) {
                     $this->sock->setExtra($this->extra);
                 }
+                $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
+                $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
                 if (!$this->sock->connect($this->parsed['host'], $port)) {
                     throw new Exception(\danog\MadelineProto\Lang::$current_lang['socket_con_error']);
                 }
-                if (!\danog\MadelineProto\Logger::$has_thread) {
-                    $this->sock->setOption(\SOL_SOCKET, \SO_RCVTIMEO, $timeout);
-                    $this->sock->setOption(\SOL_SOCKET, \SO_SNDTIMEO, $timeout);
-                }
                 $this->sock->setBlocking(true);
                 break;
             case 'udp':
diff --git a/src/danog/MadelineProto/DataCenter.php b/src/danog/MadelineProto/DataCenter.php
index 1ac37f7c..23049731 100644
--- a/src/danog/MadelineProto/DataCenter.php
+++ b/src/danog/MadelineProto/DataCenter.php
@@ -63,8 +63,13 @@ class DataCenter
         }
         $dc_config_number = isset($this->settings[$dc_number]) ? $dc_number : 'all';
         $test = $this->settings[$dc_config_number]['test_mode'] ? 'test' : 'main';
+        $x = 0;
+
+        do {
+
         $ipv6 = $this->settings[$dc_config_number]['ipv6'] ? 'ipv6' : 'ipv4';
 
+
         if (!isset($this->dclist[$test][$ipv6][$dc_number]['ip_address'])) {
             unset($this->sockets[$dc_number]);
 
@@ -96,50 +101,33 @@ class DataCenter
             $address = $this->settings[$dc_config_number]['protocol'].'://'.$address.'/api';
         }
         \danog\MadelineProto\Logger::log([sprintf(\danog\MadelineProto\Lang::$current_lang['dc_con_test_start'], $dc_number, $test, $ipv6, $this->settings[$dc_config_number]['protocol'])], \danog\MadelineProto\Logger::VERBOSE);
-
-        $x = 0;
-        do {
-            try {
-                if (isset($this->sockets[$dc_number]->old)) {
-                    $this->sockets[$dc_number]->__construct($this->settings[$dc_config_number]['proxy'], $this->settings[$dc_config_number]['proxy_extra'], $address, $port, $this->settings[$dc_config_number]['protocol'], $this->settings[$dc_config_number]['timeout'], $this->settings[$dc_config_number]['ipv6']);
-                    unset($this->sockets[$dc_number]->old);
-                } else {
-                    $this->sockets[$dc_number] = new Connection($this->settings[$dc_config_number]['proxy'], $this->settings[$dc_config_number]['proxy_extra'], $address, $port, $this->settings[$dc_config_number]['protocol'], $this->settings[$dc_config_number]['timeout'], $this->settings[$dc_config_number]['ipv6']);
+            foreach (array_unique([$port, 443, 80, 88]) as $port) {
+                \danog\MadelineProto\Logger::log(['Trying connection on port '.$port.'...'], \danog\MadelineProto\Logger::WARNING);
+                try {
+                    if (isset($this->sockets[$dc_number]->old)) {
+                        $this->sockets[$dc_number]->__construct($this->settings[$dc_config_number]['proxy'], $this->settings[$dc_config_number]['proxy_extra'], $address, $port, $this->settings[$dc_config_number]['protocol'], $this->settings[$dc_config_number]['timeout'], $this->settings[$dc_config_number]['ipv6']);
+                        unset($this->sockets[$dc_number]->old);
+                    } else {
+                        $this->sockets[$dc_number] = new Connection($this->settings[$dc_config_number]['proxy'], $this->settings[$dc_config_number]['proxy_extra'], $address, $port, $this->settings[$dc_config_number]['protocol'], $this->settings[$dc_config_number]['timeout'], $this->settings[$dc_config_number]['ipv6']);
+                    }
+                    \danog\MadelineProto\Logger::log(['OK!'], \danog\MadelineProto\Logger::WARNING);
+                    return true;
+                } catch (\danog\MadelineProto\Exception $e) {
+                } catch (\danog\MadelineProto\NothingInTheSocketException $e) {
                 }
-                \danog\MadelineProto\Logger::log(['OK!'], \danog\MadelineProto\Logger::WARNING);
-
-                return true;
-            } catch (\danog\MadelineProto\Exception $e) {
-            } catch (\danog\MadelineProto\NothingInTheSocketException $e) {
             }
-
             switch ($x) {
                case 0:
-                   \danog\MadelineProto\Logger::log(['Connection failed, retrying connection on port 443...'], \danog\MadelineProto\Logger::WARNING);
-                   $port = 443;
+                   $this->settings[$dc_config_number]['ipv6'] = !$this->settings[$dc_config_number]['ipv6'];
+                   \danog\MadelineProto\Logger::log(['Connection failed, retrying connection with '.($this->settings[$dc_config_number]['ipv6'] ? 'ipv6' : 'ipv4').'...'], \danog\MadelineProto\Logger::WARNING);
                    continue;
                case 1:
-                   \danog\MadelineProto\Logger::log(['Connection failed, retrying connection on port 80...'], \danog\MadelineProto\Logger::WARNING);
-                   $port = 80;
+                   $this->settings[$dc_config_number]['proxy'] = '\Socket';
+                   \danog\MadelineProto\Logger::log(['Connection failed, retrying connection without the proxy with '.($this->settings[$dc_config_number]['ipv6'] ? 'ipv6' : 'ipv4').'...'], \danog\MadelineProto\Logger::WARNING);
                    continue;
                case 2:
-                   \danog\MadelineProto\Logger::log(['Connection failed, retrying connection on port 88...'], \danog\MadelineProto\Logger::WARNING);
-                   $port = 88;
-                   continue;
-               case 3:
-                   \danog\MadelineProto\Logger::log(['Connection failed, retrying connection on port 443 without the proxy...'], \danog\MadelineProto\Logger::WARNING);
-                   $port = 443;
-                   $this->settings[$dc_config_number]['proxy'] = '\Socket';
-                   continue;
-               case 4:
-                   \danog\MadelineProto\Logger::log(['Connection failed, retrying connection on port 80 without the proxy...'], \danog\MadelineProto\Logger::WARNING);
-                   $port = 80;
-                   $this->settings[$dc_config_number]['proxy'] = '\Socket';
-                   continue;
-               case 5:
-                   \danog\MadelineProto\Logger::log(['Connection failed, retrying connection on port 88 without the proxy...'], \danog\MadelineProto\Logger::WARNING);
-                   $port = 88;
-                   $this->settings[$dc_config_number]['proxy'] = '\Socket';
+                   $this->settings[$dc_config_number]['ipv6'] = !$this->settings[$dc_config_number]['ipv6'];
+                   \danog\MadelineProto\Logger::log(['Connection failed, retrying connection without the proxy with '.($this->settings[$dc_config_number]['ipv6'] ? 'ipv6' : 'ipv4').'...'], \danog\MadelineProto\Logger::WARNING);
                    continue;
                default:
                    return false;
diff --git a/src/danog/MadelineProto/MTProto.php b/src/danog/MadelineProto/MTProto.php
index 93dd9f65..9ce79f1f 100644
--- a/src/danog/MadelineProto/MTProto.php
+++ b/src/danog/MadelineProto/MTProto.php
@@ -46,7 +46,7 @@ class MTProto
     /*
         const V = 71;
     */
-    const V = 89;
+    const V = 90;
 
     const NOT_LOGGED_IN = 0;
     const WAITING_CODE = 1;
diff --git a/src/danog/MadelineProto/MTProtoTools/AuthKeyHandler.php b/src/danog/MadelineProto/MTProtoTools/AuthKeyHandler.php
index 6f52ac73..d9ba6a92 100644
--- a/src/danog/MadelineProto/MTProtoTools/AuthKeyHandler.php
+++ b/src/danog/MadelineProto/MTProtoTools/AuthKeyHandler.php
@@ -22,6 +22,7 @@ trait AuthKeyHandler
 {
     public function create_auth_key($expires_in, $datacenter)
     {
+        $req_pq = strpos($datacenter, 'cdn') ? 'req_pq' : 'req_pq_multi';
         for ($retry_id_total = 1; $retry_id_total <= $this->settings['max_tries']['authorization']; $retry_id_total++) {
             try {
                 \danog\MadelineProto\Logger::log([\danog\MadelineProto\Lang::$current_lang['req_pq']], \danog\MadelineProto\Logger::VERBOSE);
@@ -44,7 +45,7 @@ trait AuthKeyHandler
                  *               ]
                  */
                 $nonce = $this->random(16);
-                $ResPQ = $this->method_call('req_pq_multi',
+                $ResPQ = $this->method_call($req_pq,
                     [
                         'nonce' => $nonce,
                     ],
@@ -370,6 +371,7 @@ trait AuthKeyHandler
                             $res_authorization['server_salt'] = substr($new_nonce, 0, 8 - 0) ^ substr($server_nonce, 0, 8 - 0);
                             $res_authorization['auth_key'] = $auth_key_str;
                             $res_authorization['id'] = substr($auth_key_sha, -8);
+                            $res_authorization['connection_inited'] = false;
 
                             \danog\MadelineProto\Logger::log(['Auth key generated'], \danog\MadelineProto\Logger::NOTICE);
 
@@ -398,6 +400,7 @@ trait AuthKeyHandler
                 \danog\MadelineProto\Logger::log(['An exception occurred while generating the authorization key: '.$e->getMessage().' in '.basename($e->getFile(), '.php').' on line '.$e->getLine().'. Retrying...'], \danog\MadelineProto\Logger::WARNING);
             } catch (\danog\MadelineProto\Exception $e) {
                 \danog\MadelineProto\Logger::log(['An exception occurred while generating the authorization key: '.$e->getMessage().' in '.basename($e->getFile(), '.php').' on line '.$e->getLine().'. Retrying...'], \danog\MadelineProto\Logger::WARNING);
+                $req_pq = $req_pq === 'req_pq_multi' ? 'req_pq' : 'req_pq_multi';
             } catch (\danog\MadelineProto\RPCErrorException $e) {
                 if ($e->rpc === 'RPC_CALL_FAIL') {
                     throw $e;
@@ -595,15 +598,17 @@ trait AuthKeyHandler
                         $socket->temp_auth_key = $this->create_auth_key($this->settings['authorization']['default_temp_auth_key_expires_in'], $id);
                         if (!$cdn) {
                             $this->bind_temp_auth_key($this->settings['authorization']['default_temp_auth_key_expires_in'], $id);
-                            $config = $this->write_client_info('help.getConfig', [], ['datacenter' => $id]);
+                            $config = $this->method_call('help.getConfig', [], ['datacenter' => $id]);
                             $this->sync_authorization($id);
                             $this->get_config($config);
                         }
                     } else {
                         $socket->temp_auth_key = $socket->auth_key;
-                        $config = $this->write_client_info('help.getConfig', [], ['datacenter' => $id]);
-                        $this->sync_authorization($id);
-                        $this->get_config($config);
+                        if (!$cdn) {
+                            $config = $this->method_call('help.getConfig', [], ['datacenter' => $id]);
+                            $this->sync_authorization($id);
+                            $this->get_config($config);
+                        }
                     }
                 } elseif (!$cdn) {
                     $this->sync_authorization($id);
diff --git a/src/danog/MadelineProto/MTProtoTools/Files.php b/src/danog/MadelineProto/MTProtoTools/Files.php
index bf2d2217..d71eb37b 100644
--- a/src/danog/MadelineProto/MTProtoTools/Files.php
+++ b/src/danog/MadelineProto/MTProtoTools/Files.php
@@ -349,10 +349,10 @@ trait Files
             if (isset($message_media['cdn_key'])) {
                 $ivec = substr($message_media['cdn_iv'], 0, 12).pack('N', $offset >> 4);
                 $res['bytes'] = $this->ctr_encrypt($res['bytes'], $message_media['cdn_key'], $ivec);
+                $this->check_cdn_hash($message_media['file_token'], $offset, $res['bytes'], $datacenter);
             }
             if (isset($message_media['key'])) {
                 $res['bytes'] = $ige->decrypt($res['bytes']);
-                $this->check_cdn_hash($message_media['file_token'], $offset, $res['bytes'], $datacenter);
             }
             if ($start_at) {
                 $res['bytes'] = substr($res['bytes'], $start_at);
@@ -399,17 +399,19 @@ trait Files
 
     private function check_cdn_hash($file, $offset, $data, &$datacenter)
     {
-        if (!isset($this->cdn_hashes[$file][$offset])) {
-            $this->add_cdn_hashes($this->method_call('upload.getCdnFileHashes', ['file_token' => $file, 'offset' => $offset], ['datacenter' => &$datacenter]));
+        while (strlen($data)) {
+            if (!isset($this->cdn_hashes[$file][$offset])) {
+                $this->add_cdn_hashes($this->method_call('upload.getCdnFileHashes', ['file_token' => $file, 'offset' => $offset], ['datacenter' => &$datacenter]));
+            }
+            if (!isset($this->cdn_hashes[$file][$offset])) {
+                throw new \danog\MadelineProto\Exception('Could not fetch CDN hashes for offset '.$offset);
+            }
+            if (hash('sha256', substr($data, 0, $this->cdn_hashes[$file][$offset]['limit']), true) !== $this->cdn_hashes[$file][$offset]['hash']) {
+                throw new \danog\MadelineProto\SecurityException('CDN hash mismatch for offset '.$offset);
+            }
+            $data = substr($data, $this->cdn_hashes[$file][$offset]['limit']);
+            $offset += $this->cdn_hashes[$file][$offset]['limit'];
         }
-        if (!isset($this->cdn_hashes[$file][$offset])) {
-            throw new \danog\MadelineProto\Exception('Could not fetch CDN hashes for offset '.$offset);
-        }
-        if (hash('sha256', $data, true) !== $this->cdn_hashes[$file][$offset]['hash']) {
-            throw new \danog\MadelineProto\SecurityException('CDN hashe mismatch for offset '.$offset);
-        }
-        unset($this->cdn_hashes[$file][$offset]);
-
         return true;
     }
 
diff --git a/src/danog/MadelineProto/MTProtoTools/ResponseHandler.php b/src/danog/MadelineProto/MTProtoTools/ResponseHandler.php
index 545362af..852ac2c1 100644
--- a/src/danog/MadelineProto/MTProtoTools/ResponseHandler.php
+++ b/src/danog/MadelineProto/MTProtoTools/ResponseHandler.php
@@ -246,7 +246,7 @@ trait ResponseHandler
                         case 'Updates':
                             unset($this->datacenter->sockets[$datacenter]->new_incoming[$current_msg_id]);
                             $unset = true;
-                            $this->handle_updates($this->datacenter->sockets[$datacenter]->incoming_messages[$current_msg_id]['content']);
+                            if (strpos($datacenter, 'cdn') === false) $this->handle_updates($this->datacenter->sockets[$datacenter]->incoming_messages[$current_msg_id]['content']);
                             $only_updates = true && $only_updates;
                             break;
                         default:
diff --git a/src/danog/MadelineProto/TL/Conversion/BotAPI.php b/src/danog/MadelineProto/TL/Conversion/BotAPI.php
index ed47a175..3af89720 100644
--- a/src/danog/MadelineProto/TL/Conversion/BotAPI.php
+++ b/src/danog/MadelineProto/TL/Conversion/BotAPI.php
@@ -473,11 +473,11 @@ trait BotAPI
 
     public function split_to_chunks($text)
     {
-        $total_length = 4096;
+        $max_length = 4096;
         $text_arr = [];
         foreach ($this->multipleExplodeKeepDelimiters(["\n"], $text) as $word) {
-            if (strlen($word) > 4096) {
-                foreach (str_split($word, 4096) as $vv) {
+            if (strlen($word) > $max_length) {
+                foreach (str_split($word, $max_length) as $vv) {
                     $text_arr[] = $vv;
                 }
             } else {
@@ -485,21 +485,13 @@ trait BotAPI
             }
         }
         $i = 0;
-        $message[0] = '';
+        $message = [''];
         foreach ($text_arr as $word) {
-            if (strlen($message[$i].$word.' ') <= $total_length) {
-                if ($text_arr[count($text_arr) - 1] == $word) {
-                    $message[$i] .= $word;
-                } else {
-                    $message[$i] .= $word.' ';
-                }
+            if (strlen($message[$i].$word) <= $max_length) {
+                $message[$i] .= $word;
             } else {
                 $i++;
-                if ($text_arr[count($text_arr) - 1] == $word) {
-                    $message[$i] = $word;
-                } else {
-                    $message[$i] = $word.' ';
-                }
+                $message[$i] = $word;
             }
         }
 
@@ -510,10 +502,13 @@ trait BotAPI
     {
         $initialArray = explode(chr(1), str_replace($delimiters, chr(1), $string));
         $finalArray = [];
+        $delimOffset = 0;
         foreach ($initialArray as $item) {
+            $delimOffset += strlen($item);
             if (strlen($item) > 0) {
-                $finalArray[] = $item.$string[strpos($string, $item) + strlen($item)];
+                $finalArray[] = $item.($delimOffset < strlen($string) ? $string[$delimOffset] : '');
             }
+            $delimOffset++;
         }
 
         return $finalArray;
diff --git a/tests/testing.php b/tests/testing.php
index ea464647..634c19c3 100755
--- a/tests/testing.php
+++ b/tests/testing.php
@@ -216,28 +216,22 @@ $time = time();
 $inputFile = $MadelineProto->upload('tests/60', 'magic'); // This gets an inputFile object with file name magic
 var_dump(time() - $time);
 $media['document'] = ['_' => 'inputMediaUploadedDocument', 'file' => $inputFile, 'mime_type' => 'magic/magic', 'caption' => 'This file was uploaded using MadelineProto', 'attributes' => [['_' => 'documentAttributeFilename', 'file_name' => 'magic.magic']]];
+
+$message = 'yay';
+$mention = $MadelineProto->get_info(getenv('TEST_USERNAME')); // Returns an array with all of the constructors that can be extracted from a username or an id
+$mention = $mention['user_id']; // Selects only the numeric user id
+
+
 foreach (json_decode(getenv('TEST_DESTINATION_GROUPS'), true) as $peer) {
     $sentMessage = $MadelineProto->messages->sendMessage(['peer' => $peer, 'message' => $message, 'entities' => [['_' => 'inputMessageEntityMentionName', 'offset' => 0, 'length' => mb_strlen($message), 'user_id' => $mention]]]);
     \danog\MadelineProto\Logger::log([$sentMessage], \danog\MadelineProto\Logger::NOTICE);
 
     foreach ($media as $type => $inputMedia) {
-        $type = $MadelineProto->messages->sendMedia(['peer' => $peer, 'media' => $inputMedia]);
+        $type = $MadelineProto->messages->sendMedia(['peer' => $peer, 'media' => $inputMedia, 'message' => '['.$message.'](mention:'.$mention.')', 'parse_mode' => 'markdown']);
     }
 }
-//var_dump($MadelineProto->API->get_updates());
-
-if ($bot_token = getenv('BOT_TOKEN')) {
-    $MadelineProto = new \danog\MadelineProto\API($settings);
-    $authorization = $MadelineProto->bot_login($bot_token);
-    \danog\MadelineProto\Logger::log([$authorization], \danog\MadelineProto\Logger::NOTICE);
-}
-$message = 'yay';
-$mention = $MadelineProto->get_info(getenv('TEST_USERNAME')); // Returns an array with all of the constructors that can be extracted from a username or an id
-$mention = $mention['user_id']; // Selects only the numeric user id
 
 foreach (json_decode(getenv('TEST_DESTINATION_GROUPS'), true) as $peer) {
     $sentMessage = $MadelineProto->messages->sendMessage(['peer' => $peer, 'message' => $message, 'entities' => [['_' => 'inputMessageEntityMentionName', 'offset' => 0, 'length' => mb_strlen($message), 'user_id' => $mention]]]);
     \danog\MadelineProto\Logger::log([$sentMessage], \danog\MadelineProto\Logger::NOTICE);
 }
-//var_dump($MadelineProto->API->get_updates());
-var_dump('HERE');