If flashing the modem file alone does not work, you may need professional service tools:
Repairing a "Null IMEI" typically requires flashing just the modem partition using :
: Search for the specific "A310N0 modem.tar" or ".zip" from reputable mobile repair forums or the Tshepiso GSM Solutions Archive . If flashing the modem file alone does not
: Place the .tar modem file into the CP slot of Odin and click Start . Alternatives for IMEI Repair
: Can perform "IMEI Repair + Patch Certificate" procedures. : A hardware-based tool used for deep software
: A hardware-based tool used for deep software repairs and network patching on Samsung devices.
: Turn off your device, then hold the Power + Home + Volume Down buttons. How to Use the Modem File
: Often found in community-shared archives under names like Raja Shoaib or Tshepiso GSM Solutions . How to Use the Modem File