: Ensure your phone has at least 80% battery to prevent it from shutting down during the flash.
| Method | Technical Principle | Cost | Difficulty | |--------|--------------------|------|------------| | | Enter code via #7465625*638*# menu (factory service menu) | $10–$25 USD | Easy | | 2. Setool / Octopus Box | Direct TA rewrite using JTAG/diag mode | $100+ hardware + credits | Hard | | 3. Server-side remote unlock | Uses USB diagnostic mode + paid server (e.g., UnlockServer) | $15–$40 | Medium | | 4. Replace SIM card tray PCB | Some C6802 models store lock on a separate EEPROM on SIM flex cable | $20–$50 (used part) | Medium (requires soldering or flex replacement) |
Removing a forgotten screen lock on the Sony Xperia Z Ultra (C6802) typically requires a full firmware flash using an
: Download and install the latest version from the official Flashtool site.
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