This is the most common solution when a backup does not exist. It involves using a generic NVRAM database file (APDB / BPLGUInfo) and injecting the device's specific IMEIs into it.

Required Tools:

Procedure using MAUI META 3G:

This method restores only the NVRAM partition without re-flashing the whole ROM.

How do you know it's an NVRAM issue and not a SIM card or antenna problem? Look for these signs:

If you see any of these, you need a clean Tecno KG5k NVRAM file.