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.
Below is the guide to restoring your network functions using a clean NVData file. Device: Oppo A83 (Model CPH1729).
IMEI repair is intended for restoring original device functionality. Modifying IMEI is illegal in many regions. Proceed at your own risk.
Select the clean Oppo A83 CPH1729 NVData file and write it to the device.
In your tool of choice, perform a "Format NVData/NVRAM" to clear the corrupted sectors.
