diff --git a/main/main.cpp b/main/main.cpp
index bc09427..a83e6c9 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -66,9 +66,9 @@ void app_main(void)
     WANdev.Reset(getUniqueID(), Parameters.AppKey);    // set default LoRaWAN config.
     if(WANdev.ReadFromNVS()!=ESP_OK)                   // if can't read the LoRaWAN setup from NVS
     { WANdev.WriteToNVS(); }                           // then store the default
-    // if(memcmp(WANdev.AppKey, Parameters.AppKey, 16))   // if LoRaWAN key different from the one in Parameters
-    // { WANdev.Reset(getUniqueID(), Parameters.AppKey);  // then reset LoRaWAN to this key
-    //   WANdev.WriteToNVS(); }                           // and save LoRaWAN config. to NVS
+    if(WANdev.State<2 && memcmp(WANdev.AppKey, Parameters.AppKey, 16))   // if LoRaWAN key different from the one in Parameters
+    { WANdev.Reset(getUniqueID(), Parameters.AppKey);  // then reset LoRaWAN to this key
+      WANdev.WriteToNVS(); }                           // and save LoRaWAN config. to NVS
 #endif
 
     CONS_UART_SetBaudrate(Parameters.CONbaud);