If you still see “Not registered on network,” clear the modem state:
tool on a PC to perform a "Software Repair". This reinstalls the official firmware and can occasionally rebuild a corrupted EFS/NVRAM partition if the damage is minor. Factory Reset repair imei sony xz3
If your IMEI is missing or "null" due to a software glitch or a bad custom ROM, flashing the original stock firmware can often restore it . If you still see “Not registered on network,”
Warning: changing or repairing an IMEI can be illegal in some jurisdictions and may void warranties. This guide is for informational purposes only — proceed only if you own the device and local law permits. Back up all data before attempting anything. repair imei sony xz3