MTK Meta Utility, UnlockTool, or SP Flash Tool (with DA file). Driver: VCOM/MTK USB Drivers installed. Backup: Always backup your current ROM before proceeding. The Repair Process:

In your tool of choice, perform a "Format NVData/NVRAM" to clear the corrupted sectors.

Note: Only restore the original IMEI that belongs to the device. [Insert your download link here for the NVData/Dump file] Troubleshooting:

After flashing, reboot the device. The baseband should now show its version number in Settings > About Phone . IMEI Repair:

Below is the guide to restoring your network functions using a clean NVData file. Device: Oppo A83 (Model CPH1729).

Put your phone into BROM Mode (Volume Up + Volume Down while connecting to PC).

If the IMEI is still null or "0000...", use a Meta Mode tool to write the original IMEI found on the back of the device or the box.

Check your filter drivers (LibUSB) and ensure the cable is high-quality.