diff --git a/tasmota/settings.h b/tasmota/settings.h
index af74422df..8b7fe2822 100644
--- a/tasmota/settings.h
+++ b/tasmota/settings.h
@@ -91,7 +91,7 @@ typedef union {                            // Restricted by MISRA-C Rule 18.4 bu
     uint32_t grouptopic_mode : 1;          // bit 25 (v7.0.0.1)  - SetOption75 - GroupTopic replaces %topic% (0) or fixed topic cmnd/grouptopic (1)
     uint32_t bootcount_update : 1;         // bit 26 (v7.0.0.4)  - SetOption76 - Enable incrementing bootcount when deepsleep is enabled
     uint32_t slider_dimmer_stay_on : 1;    // bit 27 (v7.0.0.6)  - SetOption77 - Do not power off if slider moved to far left
-    uint32_t spare28 : 1;
+    uint32_t compatibility_check : 1;      // bit 28 (v7.1.2.6)  - SetOption78 - Disable OTA compatibility check
     uint32_t spare29 : 1;
     uint32_t shutter_mode : 1;             // bit 30 (v6.6.0.14) - SetOption80 - Enable shutter support
     uint32_t pcf8574_ports_inverted : 1;   // bit 31 (v6.6.0.14) - SetOption81 - Invert all ports on PCF8574 devices
@@ -428,7 +428,7 @@ struct SYSCFG {
   unsigned long weight_calibration;        // 7C4
   unsigned long energy_frequency_calibration;  // 7C8 also used by HX711 to save last weight
   uint16_t      web_refresh;               // 7CC
-  char          mems[MAX_RULE_MEMS][10];   // 7CE
+  char          mems[MAX_RULE_MEMS][10];   // 7CE - Used by scripter as script_pram
 
   char          rules[MAX_RULE_SETS][MAX_RULE_SIZE];  // 800 uses 512 bytes in v5.12.0m, 3 x 512 bytes in v5.14.0b
 
diff --git a/tasmota/settings.ino b/tasmota/settings.ino
index b572ca645..afbd7b223 100644
--- a/tasmota/settings.ino
+++ b/tasmota/settings.ino
@@ -345,6 +345,10 @@ void SetFlashModeDout(void)
 
 uint32_t OtaVersion(void)
 {
+  if (Settings.flag3.compatibility_check) {
+    return 0xFFFFFFFF;
+  }
+
   eboot_command ebcmd;
   eboot_command_read(&ebcmd);
   uint32_t start_address = ebcmd.args[0];
diff --git a/tasmota/xdrv_01_webserver.ino b/tasmota/xdrv_01_webserver.ino
index fe10e4cd3..8aece2be8 100644
--- a/tasmota/xdrv_01_webserver.ino
+++ b/tasmota/xdrv_01_webserver.ino
@@ -511,9 +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
+  "|" D_UPLOAD_ERR_14
   ;
 
 const uint16_t DNS_PORT = 53;
@@ -2141,9 +2140,10 @@ void HandleUploadDone(void)
   if (Web.upload_error) {
     WSContentSend_P(PSTR("%06x'>" D_FAILED "</font></b><br><br>"), WebColor(COL_TEXT_WARNING));
 #ifdef USE_RF_FLASH
-    if (Web.upload_error < 14) {
+    if (Web.upload_error < 15) {
 #else
-    if (Web.upload_error < 11) {
+    if ((Web.upload_error < 10) || (14 == Web.upload_error)) {
+      if (14 == Web.upload_error) { Web.upload_error = 10; }
 #endif
       GetTextIndexed(error, sizeof(error), Web.upload_error -1, kUploadErrors);
     } else {
@@ -2238,7 +2238,7 @@ void HandleUploadLoop(void)
           Update.end();              // End esp8266 update session
           Web.upload_file_type = UPL_EFM8BB1;
 
-          Web.upload_error = SnfBrUpdateInit();
+          Web.upload_error = SnfBrUpdateInit();  // 10, 11
           if (Web.upload_error != 0) { return; }
         } else
 #endif  // USE_RF_FLASH
@@ -2246,7 +2246,7 @@ void HandleUploadLoop(void)
         if ((WEMOS == my_module_type) && (upload.buf[0] == ':')) {  // Check if this is a ARDUINO SLAVE hex file
           Update.end();              // End esp8266 update session
           Web.upload_file_type = UPL_TASMOTASLAVE;
-          Web.upload_error = TasmotaSlave_UpdateInit();
+          Web.upload_error = TasmotaSlave_UpdateInit();  // 0
           if (Web.upload_error != 0) { return; }
         } else
 #endif
@@ -2281,13 +2281,13 @@ void HandleUploadLoop(void)
         free(efm8bb1_update);
         efm8bb1_update = nullptr;
         if (result != 0) {
-          Web.upload_error = abs(result);  // 2 = Not enough space, 8 = File invalid
+          Web.upload_error = abs(result);  // 2 = Not enough space, 8 = File invalid, 12, 13
           return;
         }
       }
       ssize_t result = rf_search_and_write(upload.buf, upload.currentSize);
       if (result < 0) {
-        Web.upload_error = abs(result);
+        Web.upload_error = abs(result);  // 8, 12, 13
         return;
       } else if (result > 0) {
         if ((size_t)result > upload.currentSize) {
@@ -2379,7 +2379,7 @@ void HandleUploadLoop(void)
       }
       if (OtaVersion() < VERSION_COMPATIBLE) {
         AbandonOta();
-        Web.upload_error = 10;  // Not compatible
+        Web.upload_error = 14;  // Not compatible
         return;
       }
     }