If your BlackBerry KEYone is stuck in the Backup Bootloader Menu (often showing a purple LED or the BlackBerry logo and then looping back to the menu), it usually indicates a corruption in the operating system or a hardware fault with the battery or buttons.
Check for Physical Interference: If you use a tight case, it may be pressing against the buttons. Remove the case and try rebooting. Advanced Troubleshooting blackberry keyone stuck in bootloader menu repack
The bootloader menu, also known as the bootloader mode or fastboot mode, is a special mode on your BlackBerry KEYone that allows you to perform advanced operations, such as flashing firmware, unlocking the bootloader, and more. However, if your device gets stuck in this mode, it can be frustrating. If your BlackBerry KEYone is stuck in the
using a wall outlet (not a computer USB port) before attempting to reboot. fastboot flash abl abl
If you see a serial number (e.g., abcd1234 fastboot), you are connected. If not, reinstall drivers.
Type fastboot oem reboot-b bootloader and press Enter.