diff --git a/mini-beieli-node-cubecell.ino b/mini-beieli-node-cubecell.ino
index 4252a40..cc6eadd 100644
--- a/mini-beieli-node-cubecell.ino
+++ b/mini-beieli-node-cubecell.ino
@@ -12,19 +12,16 @@ BME280 bme280;
 /******************************************************************************/
 /* Firmware Version                                                           */
 /******************************************************************************/
-static const int32_t fwVersion = 20210205;
+static const int32_t fwVersion = 20210206;
 
 /******************************************************************************/
 /* LoraWAN Settings                                                           */
 /******************************************************************************/
 
 /* OTAA para*/
-//uint8_t devEui[] = { 0x22, 0x32, 0x33, 0x00, 0x00, 0x88, 0x88, 0x02 };
-//uint8_t appEui[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-//uint8_t appKey[] = { 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x66, 0x01 };
-uint8_t devEui[] = { 0x00, 0x00, 0xd3, 0xa6, 0x59, 0x83, 0x3b, 0x25 };
-uint8_t appEui[] = { 0x70, 0xb3, 0xd5, 0x7e, 0xd0, 0x02, 0xe5, 0xab };
-uint8_t appKey[] = { 0x00, 0x00, 0xd3, 0xa6, 0x59, 0x83, 0x3b, 0x25, 0x00, 0x00, 0xd3, 0xa6, 0x59, 0x83, 0x3b, 0x25 };
+uint8_t devEui[8];
+uint8_t appEui[8];
+uint8_t appKey[16];
 
 /* ABP para*/
 uint8_t nwkSKey[] = { 0x15, 0xb1, 0xd0, 0xef, 0xa4, 0x63, 0xdf, 0xbe, 0x3d, 0x11, 0x18, 0x1e, 0x1e, 0xc7, 0xda, 0x85 };
@@ -170,6 +167,9 @@ typedef struct {
   float cal_a_factor;                               // 4 Bytes, Kalibrationsfaktor Waegezelle 1
   float cal_b_factor;                               // 4 Bytes, Kalibrationsfaktor Waegezelle 2
   byte debug_level;                                 // 0 => no debugging, no led, 1 => infos, no led, 2 => infos, 3 => error, 4 => highest level
+  uint8_t devEui[8];                                // keep OTAA settings so that new fw-updates does not overwrite it
+  uint8_t appEui[8];                                // dito
+  uint8_t appKey[16];                               // dito
 } __attribute__((packed)) CONFIG_data;
 
 typedef struct {
@@ -655,6 +655,19 @@ bool checkUserAt(char *cmd, char *content)
     return true;
   }
 
+  if (strcmp(cmd, "SAVE_OTAA_CONFIG") == 0)
+  {
+    if (content[0] == '1')
+    {
+      memcpy(config_data.devEui, devEui, sizeof(devEui));
+      memcpy(config_data.appEui, appEui, sizeof(appEui));
+      memcpy(config_data.appKey, appKey, sizeof(appKey));
+      WriteConfigDataToFlash();
+      Serial.printf("saved OTAA configuration to flash\n");
+    }
+    return true;
+  }
+
   if (strcmp(cmd, "READ_SENSORS") == 0)
   {
     if (content[0] == '?')
@@ -763,6 +776,10 @@ void setup_platform(void)
 
   // read config_data from flash...
   ReadConfigDataFromFlash();
+  memcpy(devEui, config_data.devEui, sizeof(config_data.devEui));
+  memcpy(appEui, config_data.appEui, sizeof(config_data.appEui));
+  memcpy(appKey, config_data.appKey, sizeof(config_data.appKey));
+
   if (config_data.debug_level > 0) {
     Serial.printf("Setup_platform, this is the configuration\n");
     Serial.printf("cal_a_0: %d\n", config_data.cal_a_0);
diff --git a/mini-beieli-provision-cubecell.go b/mini-beieli-provision-cubecell.go
index e6c1674..7bcb881 100644
--- a/mini-beieli-provision-cubecell.go
+++ b/mini-beieli-provision-cubecell.go
@@ -79,6 +79,7 @@ func main() {
 		sendCommand(s, "AT+DevEui="+devEui)
 		sendCommand(s, "AT+AppEui="+appEui)
 		sendCommand(s, "AT+AppKey="+devEui+devEui)
+		sendCommand(s, "AT+SAVE_OTAA_CONFIG=1")
 		sendCommand(s, "AT+RESET=1")
 		readSerial(s)
 	} else {