Lock and unlock the bootloader | Android Open Source Project
If your goal is to actually unlock the bootloader (not just look at it), you must enable this setting. If this setting is missing or greyed out, your carrier may have blocked unlocking. how to open bootloader mode on nokia 14
If your physical buttons are not working correctly, you can use a computer with ADB and Fastboot tools installed: USB Debugging Developer options of your phone. Connect your phone to the PC via a USB cable. Open a command prompt or terminal on your PC and type: adb reboot bootloader Android Open Source Project Exiting Bootloader Mode Lock and unlock the bootloader | Android Open
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