Dial *#06# or go to Settings > System > About phone > IMEI .
For the owner of an XZ3 staring at "No Service," a successful repair doesn't just bring back 4G bars—it brings the device back from the dead. It is a testament to the fact that even in our disposable tech culture, with the right skills, almost anything can be fixed.
If the EFS partition is physically damaged (bad NAND blocks), no software repair will work. A replacement motherboard for XZ3 costs around $80–120 on eBay. After swapping, the IMEI will match the new board—so re-solder the old SIM slot’s chip if needed to retain legality.
Sony FlashTool (32bit/64bit) and the correct firmware for your specific XZ3 model. Steps:
IMEI After Software Corruption
and hold the button while connecting it to the PC. Note : This will wipe all user data. Method 2: Advanced Repair via Diagnostics Mode