diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 0a05ce8b8..b11d0ce44 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -73,3 +73,4 @@ The following binary downloads have been compiled with ESP8266/Arduino library c
 - Add Zigbee support for Xiaomi Aqara Vibration Sensor and Presence Sensor by Stefan Hadinger
 - Add Shutter functions ramp up/down and MQTT reporting by Stefan Bode
 - Add fallback support from version 8.x
+- Add restriction if fallback firmware is incompatible with settings resulting in unreachable device
diff --git a/tasmota/CHANGELOG.md b/tasmota/CHANGELOG.md
index a7fcd5217..622645aa8 100644
--- a/tasmota/CHANGELOG.md
+++ b/tasmota/CHANGELOG.md
@@ -13,6 +13,7 @@
 - Add Zigbee send automatic ZigbeeRead after sending a command
 - Add Zigbee improving Occupancy:false detection for Aqara sensor
 - Add fallback support from version 8.x
+- Add restriction if fallback firmware is incompatible with settings resulting in unreachable device
 
 ### 7.1.2.5 20191213
 
diff --git a/tasmota/i18n.h b/tasmota/i18n.h
index fed6930d7..1844dd44b 100644
--- a/tasmota/i18n.h
+++ b/tasmota/i18n.h
@@ -635,4 +635,8 @@ const char S_INFORMATION[] PROGMEM = D_INFORMATION;
 const char S_RESTART[] PROGMEM = D_RESTART;
 #endif  // USE_WEBSERVER
 
+const uint32_t MARKER_START = 0x5AA55AA5;
+const uint32_t MARKER_END = 0xA55AA55A;
+const uint32_t VERSION_MARKER[] PROGMEM = { MARKER_START, VERSION, MARKER_END };
+
 #endif  // _I18N_H_
diff --git a/tasmota/language/bg-BG.h b/tasmota/language/bg-BG.h
index 1f18d8efb..251a840e8 100644
--- a/tasmota/language/bg-BG.h
+++ b/tasmota/language/bg-BG.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Грешка при изтриване на RF чипа"
 #define D_UPLOAD_ERR_12 "Грешка при записване в RF чипа"
 #define D_UPLOAD_ERR_13 "Грешка при декодиране на RF фърмуера"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Код на грешка при зареждането"
 
 #define D_ENTER_COMMAND "Въвеждане на команда"
diff --git a/tasmota/language/cs-CZ.h b/tasmota/language/cs-CZ.h
index 1d7c6f381..79ba068ab 100644
--- a/tasmota/language/cs-CZ.h
+++ b/tasmota/language/cs-CZ.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Chyba smazání RF chipu"
 #define D_UPLOAD_ERR_12 "Chyba při zápisu do RF chipu"
 #define D_UPLOAD_ERR_13 "Chyba dekódování RF firmwaru"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Chyba nahrávání"
 
 #define D_ENTER_COMMAND "Vlož příkaz"
diff --git a/tasmota/language/de-DE.h b/tasmota/language/de-DE.h
index 6569dd232..3cb7786af 100644
--- a/tasmota/language/de-DE.h
+++ b/tasmota/language/de-DE.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "RF Chip löschen fehlgeschlagen"
 #define D_UPLOAD_ERR_12 "RF Chip beschreiben fehlgeschlagen"
 #define D_UPLOAD_ERR_13 "RF Firmware ungültig"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Upload Fehler Nummer"
 
 #define D_ENTER_COMMAND "Befehl eingeben"
diff --git a/tasmota/language/el-GR.h b/tasmota/language/el-GR.h
index f8b9c9614..3bea69d8f 100644
--- a/tasmota/language/el-GR.h
+++ b/tasmota/language/el-GR.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Αποτυχία σβησίματος στο RF chip"
 #define D_UPLOAD_ERR_12 "Αποτυχία εγγραφής στο RF chip"
 #define D_UPLOAD_ERR_13 "Failed to decode RF firmware"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Κωδικός λάθους στη μεταφόρτωση"
 
 #define D_ENTER_COMMAND "Εισαγωγή εντολής"
diff --git a/tasmota/language/en-GB.h b/tasmota/language/en-GB.h
index 257a34c86..d64632603 100644
--- a/tasmota/language/en-GB.h
+++ b/tasmota/language/en-GB.h
@@ -28,7 +28,7 @@
  * Use online command StateText to translate ON, OFF, HOLD and TOGGLE.
  * Use online command Prefix to translate cmnd, stat and tele.
  *
- * Updated until v6.2.1.11
+ * Updated until v8.0.0.0
 \*********************************************************************/
 
 //#define LANGUAGE_MODULE_NAME         // Enable to display "Module Generic" (ie Spanish), Disable to display "Generic Module" (ie English)
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Failed to erase RF chip"
 #define D_UPLOAD_ERR_12 "Failed to write to RF chip"
 #define D_UPLOAD_ERR_13 "Failed to decode RF firmware"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Upload error code"
 
 #define D_ENTER_COMMAND "Enter command"
diff --git a/tasmota/language/es-ES.h b/tasmota/language/es-ES.h
index 7527bb77a..b0c9477de 100644
--- a/tasmota/language/es-ES.h
+++ b/tasmota/language/es-ES.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "No se pudo borrar en el chip RF"
 #define D_UPLOAD_ERR_12 "No se puedo escribir en el chip RF"
 #define D_UPLOAD_ERR_13 "No se pudo decodificar firmware RF"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Código de error de carga"
 
 #define D_ENTER_COMMAND "Ingresar comando"
diff --git a/tasmota/language/fr-FR.h b/tasmota/language/fr-FR.h
index e107409e3..48576002e 100644
--- a/tasmota/language/fr-FR.h
+++ b/tasmota/language/fr-FR.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Erreur d'effacement du chip RF"
 #define D_UPLOAD_ERR_12 "Erreur d'accès en écriture au chip RF"
 #define D_UPLOAD_ERR_13 "Erreur de décodage du firmware RF"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Code d'erreur téléchargement"
 
 #define D_ENTER_COMMAND "Saisir une commande"
diff --git a/tasmota/language/he-HE.h b/tasmota/language/he-HE.h
index ac4dadb8e..1d4a1b549 100644
--- a/tasmota/language/he-HE.h
+++ b/tasmota/language/he-HE.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "נכשלה RF מחיקת שבב"
 #define D_UPLOAD_ERR_12 "נכשלה RF כתיבת שבב"
 #define D_UPLOAD_ERR_13 "נכשלה RF קידוד קושחת שבב"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "שגיאת קוד העלאה"
 
 #define D_ENTER_COMMAND "הקש פקודה"
diff --git a/tasmota/language/hu-HU.h b/tasmota/language/hu-HU.h
index 62806fa46..111558516 100644
--- a/tasmota/language/hu-HU.h
+++ b/tasmota/language/hu-HU.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Az RF chip törlése sikertelen"
 #define D_UPLOAD_ERR_12 "Az RF chip írása sikertelen"
 #define D_UPLOAD_ERR_13 "Az RF firmware dekódolása sikertelen"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Feltöltési hibakód"
 
 #define D_ENTER_COMMAND "Kérem a parancsot..."
diff --git a/tasmota/language/it-IT.h b/tasmota/language/it-IT.h
index 0585c12d8..edf9b92c2 100644
--- a/tasmota/language/it-IT.h
+++ b/tasmota/language/it-IT.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Cancellazione fallita del chip RF"
 #define D_UPLOAD_ERR_12 "Scrittura fallita del chip RF"
 #define D_UPLOAD_ERR_13 "Decodifica fallita del firmware RF"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Codice errore invio"
 
 #define D_ENTER_COMMAND "Inserire comando"
diff --git a/tasmota/language/ko-KO.h b/tasmota/language/ko-KO.h
index bff508474..4e20860f5 100644
--- a/tasmota/language/ko-KO.h
+++ b/tasmota/language/ko-KO.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "RF 칩 삭제 실패"
 #define D_UPLOAD_ERR_12 "RF 칩 쓰기 실패"
 #define D_UPLOAD_ERR_13 "RF 펌웨어 decode 실패"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "업로드 에러 코드"
 
 #define D_ENTER_COMMAND "커맨드 입력"
diff --git a/tasmota/language/nl-NL.h b/tasmota/language/nl-NL.h
index 75d841ddc..e49b71ca1 100644
--- a/tasmota/language/nl-NL.h
+++ b/tasmota/language/nl-NL.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Wissen RF chip mislukt"
 #define D_UPLOAD_ERR_12 "Opwaarderen RF chip mislukt"
 #define D_UPLOAD_ERR_13 "Decoderen RF bestand mislukt"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Opwaardeer foutcode"
 
 #define D_ENTER_COMMAND "Geef opdracht"
diff --git a/tasmota/language/pl-PL.h b/tasmota/language/pl-PL.h
index 8f5af6813..a2aada42b 100644
--- a/tasmota/language/pl-PL.h
+++ b/tasmota/language/pl-PL.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Błąd kasowania układu RF"
 #define D_UPLOAD_ERR_12 "Błąd zapisu układu RF"
 #define D_UPLOAD_ERR_13 "Błąd dekodowania oprrogramowania układu RF"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Błąd wgrywania"
 
 #define D_ENTER_COMMAND "Wprowadź polecenie"
diff --git a/tasmota/language/pt-BR.h b/tasmota/language/pt-BR.h
index 0efa57789..ae808ef9e 100644
--- a/tasmota/language/pt-BR.h
+++ b/tasmota/language/pt-BR.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Falha ao apagar o chip RF"
 #define D_UPLOAD_ERR_12 "Falha ao escrever o chip RF"
 #define D_UPLOAD_ERR_13 "Falha ao decodificar o firmware de RF"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Código de erro do envio"
 
 #define D_ENTER_COMMAND "Inserir comando"
diff --git a/tasmota/language/pt-PT.h b/tasmota/language/pt-PT.h
index a6299c0c8..e6684232c 100644
--- a/tasmota/language/pt-PT.h
+++ b/tasmota/language/pt-PT.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Falha ao apagar o chip de RF"
 #define D_UPLOAD_ERR_12 "Falha ao escrever no chip de RF"
 #define D_UPLOAD_ERR_13 "Falha ao descodificar o firmware RF"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Código de erro do envio"
 
 #define D_ENTER_COMMAND "Inserir comando"
diff --git a/tasmota/language/ru-RU.h b/tasmota/language/ru-RU.h
index 3bd788ede..cd5c072aa 100644
--- a/tasmota/language/ru-RU.h
+++ b/tasmota/language/ru-RU.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Failed to erase RF chip"
 #define D_UPLOAD_ERR_12 "Failed to write to RF chip"
 #define D_UPLOAD_ERR_13 "Failed to decode RF firmware"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Код ошибки загрузки"
 
 #define D_ENTER_COMMAND "Введите команду"
diff --git a/tasmota/language/sk-SK.h b/tasmota/language/sk-SK.h
index a64e49e01..ef16212ca 100644
--- a/tasmota/language/sk-SK.h
+++ b/tasmota/language/sk-SK.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Chyba zmazania RF chipu"
 #define D_UPLOAD_ERR_12 "Chyba pri zápise do RF chipu"
 #define D_UPLOAD_ERR_13 "Chyba dekódovania RF firmwaru"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Chyba nahrávania"
 
 #define D_ENTER_COMMAND "Vlož príkaz"
diff --git a/tasmota/language/sv-SE.h b/tasmota/language/sv-SE.h
index 51ffc2ae3..971ee42b1 100644
--- a/tasmota/language/sv-SE.h
+++ b/tasmota/language/sv-SE.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Misslyckades rensa RF chip"
 #define D_UPLOAD_ERR_12 "Misslyckades skriva till RF chip"
 #define D_UPLOAD_ERR_13 "Misslyckades avkoda RF firmware"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Uppladdningsfelkod"
 
 #define D_ENTER_COMMAND "Ange kommando"
diff --git a/tasmota/language/tr-TR.h b/tasmota/language/tr-TR.h
index 6bc48c40f..67400d1cc 100644
--- a/tasmota/language/tr-TR.h
+++ b/tasmota/language/tr-TR.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Failed to erase RF chip"
 #define D_UPLOAD_ERR_12 "Failed to write to RF chip"
 #define D_UPLOAD_ERR_13 "Failed to decode RF firmware"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Upload error code"
 
 #define D_ENTER_COMMAND "Komut girişi"
diff --git a/tasmota/language/uk-UK.h b/tasmota/language/uk-UK.h
index b4a314630..b81f30012 100644
--- a/tasmota/language/uk-UK.h
+++ b/tasmota/language/uk-UK.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Помилка стирання чипу RF"
 #define D_UPLOAD_ERR_12 "Помилка запису чипу RF"
 #define D_UPLOAD_ERR_13 "Помилка розкодування прошивки RF"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "Код помилки завантаження"
 
 #define D_ENTER_COMMAND "Уведіть команду"
diff --git a/tasmota/language/zh-CN.h b/tasmota/language/zh-CN.h
index 21aa63be3..665f39fc3 100644
--- a/tasmota/language/zh-CN.h
+++ b/tasmota/language/zh-CN.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "擦除 RF 芯片失败"
 #define D_UPLOAD_ERR_12 "写入 RF 芯片失败"
 #define D_UPLOAD_ERR_13 "解码 RF 固件失败"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "上传错误代码"
 
 #define D_ENTER_COMMAND "输入命令"
diff --git a/tasmota/language/zh-TW.h b/tasmota/language/zh-TW.h
index 1d78f181e..6f56e03df 100644
--- a/tasmota/language/zh-TW.h
+++ b/tasmota/language/zh-TW.h
@@ -353,6 +353,7 @@
 #define D_UPLOAD_ERR_11 "Failed to erase RF chip"
 #define D_UPLOAD_ERR_12 "Failed to write to RF chip"
 #define D_UPLOAD_ERR_13 "Failed to decode RF firmware"
+#define D_UPLOAD_ERR_14 "Not compatible"
 #define D_UPLOAD_ERROR_CODE "上傳錯誤代碼"
 
 #define D_ENTER_COMMAND "輸入命令"
diff --git a/tasmota/settings.ino b/tasmota/settings.ino
index d921e4957..b572ca645 100644
--- a/tasmota/settings.ino
+++ b/tasmota/settings.ino
@@ -343,6 +343,44 @@ void SetFlashModeDout(void)
   delete[] _buffer;
 }
 
+uint32_t OtaVersion(void)
+{
+  eboot_command ebcmd;
+  eboot_command_read(&ebcmd);
+  uint32_t start_address = ebcmd.args[0];
+  uint32_t end_address = start_address + (ebcmd.args[2] & 0xFFFFF000) + FLASH_SECTOR_SIZE;
+  uint32_t* buffer = new uint32_t[FLASH_SECTOR_SIZE / 4];
+
+  uint32_t version[3] = { 0 };
+  bool found = false;
+  for (uint32_t address = start_address; address < end_address; address = address + FLASH_SECTOR_SIZE) {
+    ESP.flashRead(address, (uint32_t*)buffer, FLASH_SECTOR_SIZE);
+    for (uint32_t i = 0; i < (FLASH_SECTOR_SIZE / 4); i++) {
+      version[0] = version[1];
+      version[1] = version[2];
+      version[2] = buffer[i];
+      if ((version[0] == MARKER_START) && (version[2] == MARKER_END)) {
+        found = true;
+        break;
+      }
+    }
+    if (found) { break; }
+  }
+  delete[] buffer;
+
+  if (!found) { version[1] = 0; }
+
+  AddLog_P2(LOG_LEVEL_DEBUG, PSTR("OTA: Version 0x%08X, Compatible 0x%08X"), version[1], VERSION_COMPATIBLE);
+
+  return version[1];
+}
+
+void AbandonOta(void)
+{
+  uint32_t eboot_magic = 0;
+  ESP.rtcUserMemoryWrite(0, (uint32_t*)&eboot_magic, sizeof(eboot_magic));
+}
+
 void SettingsBufferFree(void)
 {
   if (settings_buffer != nullptr) {
diff --git a/tasmota/support_tasmota.ino b/tasmota/support_tasmota.ino
index 0935d9a28..08b898efb 100644
--- a/tasmota/support_tasmota.ino
+++ b/tasmota/support_tasmota.ino
@@ -866,13 +866,21 @@ void Every250mSeconds(void)
       }
       if (90 == ota_state_flag) {  // Allow MQTT to reconnect
         ota_state_flag = 0;
+        Response_P(PSTR("{\"" D_CMND_UPGRADE "\":\""));
         if (ota_result) {
 //          SetFlashModeDout();      // Force DOUT for both ESP8266 and ESP8285
-          Response_P(PSTR(D_JSON_SUCCESSFUL ". " D_JSON_RESTARTING));
+          if (OtaVersion() < VERSION_COMPATIBLE) {
+            AbandonOta();
+            ResponseAppend_P(PSTR(D_JSON_FAILED " " D_UPLOAD_ERR_14));
+          } else {
+            ResponseAppend_P(PSTR(D_JSON_SUCCESSFUL ". " D_JSON_RESTARTING));
+            restart_flag = 2;
+          }
         } else {
-          Response_P(PSTR(D_JSON_FAILED " %s"), ESPhttpUpdate.getLastErrorString().c_str());
+          ResponseAppend_P(PSTR(D_JSON_FAILED " %s"), ESPhttpUpdate.getLastErrorString().c_str());
         }
-        restart_flag = 2;          // Restart anyway to keep memory clean webserver
+        ResponseAppend_P(PSTR("\"}"));
+//        restart_flag = 2;          // Restart anyway to keep memory clean webserver
         MqttPublishPrefixTopic_P(STAT, PSTR(D_CMND_UPGRADE));
       }
     }
diff --git a/tasmota/tasmota.ino b/tasmota/tasmota.ino
index 3b9e64a25..67be9d35f 100644
--- a/tasmota/tasmota.ino
+++ b/tasmota/tasmota.ino
@@ -334,6 +334,8 @@ void setup(void)
   AddLog_P2(LOG_LEVEL_INFO, PSTR(D_WARNING_MINIMAL_VERSION));
 #endif  // FIRMWARE_MINIMAL
 
+  memcpy_P(log_data, VERSION_MARKER, 1);  // Dummy for compiler saving VERSION_MARKER
+
   RtcInit();
 
 #ifdef USE_ARDUINO_OTA
diff --git a/tasmota/tasmota_version.h b/tasmota/tasmota_version.h
index 8fe799b5b..9c9b7b189 100644
--- a/tasmota/tasmota_version.h
+++ b/tasmota/tasmota_version.h
@@ -22,4 +22,7 @@
 
 const uint32_t VERSION = 0x07020000;
 
+// Lowest compatible version
+const uint32_t VERSION_COMPATIBLE = 0x06000000;
+
 #endif  // _TASMOTA_VERSION_H_
diff --git a/tasmota/xdrv_01_webserver.ino b/tasmota/xdrv_01_webserver.ino
index 9c8131ad3..fe10e4cd3 100644
--- a/tasmota/xdrv_01_webserver.ino
+++ b/tasmota/xdrv_01_webserver.ino
@@ -511,6 +511,8 @@ const char kUploadErrors[] PROGMEM =
   D_UPLOAD_ERR_1 "|" D_UPLOAD_ERR_2 "|" D_UPLOAD_ERR_3 "|" D_UPLOAD_ERR_4 "|" D_UPLOAD_ERR_5 "|" D_UPLOAD_ERR_6 "|" D_UPLOAD_ERR_7 "|" D_UPLOAD_ERR_8 "|" D_UPLOAD_ERR_9
 #ifdef USE_RF_FLASH
   "|" D_UPLOAD_ERR_10 "|" D_UPLOAD_ERR_11 "|" D_UPLOAD_ERR_12 "|" D_UPLOAD_ERR_13
+#else
+  "|" D_UPLOAD_ERR_14
 #endif
   ;
 
@@ -2137,12 +2139,11 @@ void HandleUploadDone(void)
   WSContentSendStyle();
   WSContentSend_P(PSTR("<div style='text-align:center;'><b>" D_UPLOAD " <font color='#"));
   if (Web.upload_error) {
-//    WSContentSend_P(PSTR(COLOR_TEXT_WARNING "'>" D_FAILED "</font></b><br><br>"));
     WSContentSend_P(PSTR("%06x'>" D_FAILED "</font></b><br><br>"), WebColor(COL_TEXT_WARNING));
 #ifdef USE_RF_FLASH
     if (Web.upload_error < 14) {
 #else
-    if (Web.upload_error < 10) {
+    if (Web.upload_error < 11) {
 #endif
       GetTextIndexed(error, sizeof(error), Web.upload_error -1, kUploadErrors);
     } else {
@@ -2376,6 +2377,11 @@ void HandleUploadLoop(void)
         Web.upload_error = 6;  // Upload failed. Enable logging 3
         return;
       }
+      if (OtaVersion() < VERSION_COMPATIBLE) {
+        AbandonOta();
+        Web.upload_error = 10;  // Not compatible
+        return;
+      }
     }
     if (!Web.upload_error) {
       AddLog_P2(LOG_LEVEL_INFO, PSTR(D_LOG_UPLOAD D_SUCCESSFUL " %u bytes. " D_RESTARTING), upload.totalSize);