Extract the firmware and load the MT6765_Android_scatter.txt file into SP Flash Tool.
If the device experiences a persistent loop of valid IMEI but zero signal, the NVDATA partition may be out of sync. Use a service tool to execute an "Erase NVRAM" or "Fix Network" command, followed immediately by a fresh firmware calibration write. To help finalize your repair approach, let me know: What current status does the phone show when dialing *#06# ? xt2083-4 imei repair