diff --git a/cores/esp8266/Updater.cpp b/cores/esp8266/Updater.cpp
index 7ad21300a..ee7fe0b0f 100644
--- a/cores/esp8266/Updater.cpp
+++ b/cores/esp8266/Updater.cpp
@@ -57,6 +57,14 @@ bool UpdaterClass::begin(size_t size, int command) {
     return false;
   }
 
+  if(ESP.getFlashChipRealSize() != ESP.getFlashChipSize()) {
+    _error = UPDATE_ERROR_FLASH_CONFIG;
+#ifdef DEBUG_UPDATER
+    printError(DEBUG_UPDATER);
+#endif
+    return false;
+  }
+
   _reset();
   _error = 0;
 
@@ -278,6 +286,8 @@ void UpdaterClass::printError(Stream &out){
     out.println("Stream Read Timeout");
   } else if(_error == UPDATE_ERROR_MD5){
     out.println("MD5 Check Failed");
+  } else if(_error == UPDATE_ERROR_FLASH_CONFIG){
+    out.printf("Flash config wrong real: %d IDE: %d\n", ESP.getFlashChipRealSize(), ESP.getFlashChipSize());
   } else {
     out.println("UNKNOWN");
   }
diff --git a/cores/esp8266/Updater.h b/cores/esp8266/Updater.h
index a25cb081b..07b2708ec 100644
--- a/cores/esp8266/Updater.h
+++ b/cores/esp8266/Updater.h
@@ -5,13 +5,15 @@
 #include "flash_utils.h"
 #include "MD5Builder.h"
 
-#define UPDATE_ERROR_OK     0
-#define UPDATE_ERROR_WRITE  1
-#define UPDATE_ERROR_ERASE  2
-#define UPDATE_ERROR_SPACE  3
-#define UPDATE_ERROR_SIZE   4
-#define UPDATE_ERROR_STREAM 5
-#define UPDATE_ERROR_MD5    6
+#define UPDATE_ERROR_OK             (0)
+#define UPDATE_ERROR_WRITE          (1)
+#define UPDATE_ERROR_ERASE          (2)
+#define UPDATE_ERROR_SPACE          (3)
+#define UPDATE_ERROR_SIZE           (4)
+#define UPDATE_ERROR_STREAM         (5)
+#define UPDATE_ERROR_MD5            (6)
+#define UPDATE_ERROR_FLASH_CONFIG   (7)
+
 
 #define U_FLASH   0
 #define U_SPIFFS  100