| Error Message | Cause | Solution | |---------------|-------|----------| | Device not detected in fastboot | Driver conflict / USB port | Reinstall Sony drivers. Use USB 2.0 port. Try different cable. | | Unlock failed - remote: Command not allowed | OEM unlocking disabled in developer options | Reboot to system, re-enable OEM unlocking, try again. | | Relock failed - Certificate mismatch | Non-stock kernel or system detected | Flash full stock firmware using Newflasher (including boot and dtbo ). | | S1 protocol error 0x0009 | Device in wrong mode (flash vs fastboot) | Power off completely. Hold Volume Up, then connect USB. | | Tool crashes on Windows 11 | Missing VC++ redistributables | Install Visual C++ 2015-2022 Redistributable (x86/x64). |
Run the executable as an administrator and connect the device via a high-quality USB cable to a rear motherboard port for stability. Unlocking: SE Bootloader Unlocking Relocking 1.6.62
An unlocked bootloader means:
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