After repair, test both SIM slots, make a 5-minute call, and check for network handover (4G to 2G). Your Nokia TA-1418 is now back in action.
If the IMEI is just missing (shows 0 or null ) due to corrupt firmware: nokia ta 1418 imei repair
If the code does nothing, your firmware has disabled the engineer menu. Proceed to Method 2. After repair, test both SIM slots, make a