Use XperiaFirm (integrated into Flashtool) to download the official firmware for the C6802 .
| Parameter | Before FTF | After FTF | |-----------|-------------|-------------| | SIM lock status | Locked to Carrier X | Unlocked | | Non-original SIM | Rejected | Accepted | | IMEI | Intact | Intact (if TA not wiped) | | DRM keys | Present | Lost if TA not restored | | Bootloader status | Locked | Unlocked (permanent) | sony c6802 lock remove ftf