Power off your phone. While holding the Volume Up button, connect the phone to your PC via USB. The LED should turn blue , indicating it is in Fastboot mode.
Relocking the bootloader is often done to restore some, but not all, functionality (such as SafetyNet/Play Integrity passes in certain scenarios, though Knox remains tripped).
To relock safely, you cannot simply use fastboot oem lock . Doing so often results in a "Bootloader Unlock Allowed: No" scenario or a hard brick if the firmware version mismatches.
adb reboot bootloader
Power off the device. Connect a USB cable to a PC, then press and hold both Volume Up and Volume Down buttons while plugging the other end into the phone.
This article explains how to unlock and relock the bootloader on the SE 167Z device, what the risks are, and a verified, step-by-step procedure for doing both operations safely. Follow precisely; mistakes can permanently brick your device or void warranties.
: It could unlock the bootloader even on devices where the official Sony service menu said "Bootloader unlock allowed: No". : It featured a "Relock BL" option. By flashing a specific se bootloader unlocking relocking 167z verified
Enter the code: *#*#7378423#*#* (which spells out *#*#SERVICE#*#* ). Navigate to > Configuration > Rooting Status .
The core requirement for flashing custom ROMs, executing system-level modifications, or performing digital forensics on modern Android systems is interacting with the device partition state. Unlocking and relocking the Android bootloader requires managing cryptographic signatures and integrity flags.
The device screen will display a warning warning you about security risks. Use the physical to navigate to the "Unlock Bootloader" option and press the Power Button to execute. The device will format user data and reboot with an unlocked status. 4. The Relocking Protocol (Restoring Verified Security) Power off your phone
: Ensure all important files are backed up, as the device will be wiped. Developer Options : Go to Settings > About Phone . Tap Build Number 7 times to enable Developer Options .
The official Google and Android Open Source Project documentation recommends using fastboot flashing unlock for all devices where possible.