Use a hex editor or a specialized Qualcomm IMEI tool to locate the corrupted IMEI strings within the backup file. Overwrite them precisely with your original 15-digit hardware IMEI.
: A multibrand tool that supports Nokia IMEI repair and FRP resets. Chimera Tool nokia 8000 4g imei repair
To write the IMEI, the phone must be in a state where the PC can "talk" to its modem. Use a hex editor or a specialized Qualcomm