diff --git a/cores/esp8266/Esp.cpp b/cores/esp8266/Esp.cpp
index 5d39874fb..2c35597d4 100644
--- a/cores/esp8266/Esp.cpp
+++ b/cores/esp8266/Esp.cpp
@@ -298,6 +298,24 @@ uint32_t EspClass::getFlashChipSizeByChipId(void) {
     }
 }
 
+/**
+ * check the Flash settings from IDE against the Real flash size
+ * @param needsEquals (return only true it equals)
+ * @return ok or not
+ */
+bool EspClass::checkFlashConfig(bool needsEquals) {
+    if(needsEquals) {
+        if(getFlashChipRealSize() == getFlashChipSize()) {
+            return true;
+        }
+    } else {
+        if(getFlashChipRealSize() >= getFlashChipSize()) {
+            return true;
+        }
+    }
+    return false;
+}
+
 String EspClass::getResetInfo(void) {
     if(resetInfo.reason != 0) {
         char buff[200];
diff --git a/cores/esp8266/Esp.h b/cores/esp8266/Esp.h
index 07e1c093b..4201ec47d 100644
--- a/cores/esp8266/Esp.h
+++ b/cores/esp8266/Esp.h
@@ -117,6 +117,8 @@ class EspClass {
         FlashMode_t getFlashChipMode();
         uint32_t getFlashChipSizeByChipId();
 
+        bool checkFlashConfig(bool needsEquals = false);
+
         bool flashEraseSector(uint32_t sector);
         bool flashWrite(uint32_t offset, uint32_t *data, size_t size);
         bool flashRead(uint32_t offset, uint32_t *data, size_t size);
diff --git a/cores/esp8266/Updater.cpp b/cores/esp8266/Updater.cpp
index ee7fe0b0f..ec2411064 100644
--- a/cores/esp8266/Updater.cpp
+++ b/cores/esp8266/Updater.cpp
@@ -57,7 +57,7 @@ bool UpdaterClass::begin(size_t size, int command) {
     return false;
   }
 
-  if(ESP.getFlashChipRealSize() != ESP.getFlashChipSize()) {
+  if(ESP.checkFlashConfig(false)) {
     _error = UPDATE_ERROR_FLASH_CONFIG;
 #ifdef DEBUG_UPDATER
     printError(DEBUG_UPDATER);