diff --git a/code/espurna/config/prototypes.h b/code/espurna/config/prototypes.h
index d9b5d435..e173626e 100644
--- a/code/espurna/config/prototypes.h
+++ b/code/espurna/config/prototypes.h
@@ -157,6 +157,7 @@ bool settingsRestoreJson(JsonObject& data);
 // -----------------------------------------------------------------------------
 char * ltrim(char * s);
 void nice_delay(unsigned long ms);
+bool inline eraseSDKConfig();
 
 #define ARRAYINIT(type, name, ...) type name[] = {__VA_ARGS__};
 
diff --git a/code/espurna/terminal.ino b/code/espurna/terminal.ino
index b87918eb..7ffa7710 100644
--- a/code/espurna/terminal.ino
+++ b/code/espurna/terminal.ino
@@ -96,7 +96,7 @@ void _terminalInitCommand() {
         terminalOK();
         resetReason(CUSTOM_RESET_TERMINAL);
         _eepromCommit();
-        ESP.eraseConfig();
+        eraseSDKConfig();
         *((int*) 0) = 0; // see https://github.com/esp8266/Arduino/issues/1494
     });
 
diff --git a/code/espurna/utils.ino b/code/espurna/utils.ino
index 09e09e1b..d70eb606 100644
--- a/code/espurna/utils.ino
+++ b/code/espurna/utils.ino
@@ -578,6 +578,25 @@ bool checkNeedsReset() {
     return _reset_reason > 0;
 }
 
+// Use fixed method for Core 2.3.0, because it erases only 2 out of 4 SDK-reserved sectors
+// Fixed since 2.4.0, see: esp8266/core/esp8266/Esp.cpp: ESP::eraseConfig()
+bool eraseSDKConfig() {
+    #if defined(ARDUINO_ESP8266_RELEASE_2_3_0)
+        const size_t cfgsize = 0x4000;
+        size_t cfgaddr = ESP.getFlashChipSize() - cfgsize;
+
+        for (size_t offset = 0; offset < cfgsize; offset += SPI_FLASH_SEC_SIZE) {
+            if (!ESP.flashEraseSector((cfgaddr + offset) / SPI_FLASH_SEC_SIZE)) {
+                return false;
+            }
+        }
+
+        return true;
+    #else
+        return ESP.eraseConfig();
+    #endif
+}
+
 // -----------------------------------------------------------------------------
 
 char * ltrim(char * s) {