The only permanent fix is to restore the original factory IMEI structure using a signed, original QCN file. This is where has become a benchmark in the GSM community.
Vivo V9 (PD1730F) IMEI repair file provided by is a specialized firmware designed to restore the original IMEI and network connectivity lost due to software updates or device resets. Key Features of the Repair File Original IMEI Restoration: vivo v9 imei repair original file by gsmmafia com