This usually happens because the device's system detects that the system partition has been modified, or the boot image isn't signed correctly for the device's locked/unlocked state. Why is it stuck?
When a temporary kernel panic freezes the phone on the fastboot screen, a deep hardware reset breaks the loop. KeyONE stuck on the Fastboot menu - CrackBerry Forums blackberry keyone stuck in bootloader menu repack
button isn't stuck or jammed. If this button is physically pressed during startup, the phone will automatically enter the bootloader menu every time it reboots. 2. Power and Battery Maintenance This usually happens because the device's system detects
If your phone is "hard-bricked" (completely dark and unresponsive), you can try using the Autoloader in a different way: KeyONE stuck on the Fastboot menu - CrackBerry
Before attempting to flash your device, you must gather the correct software tools and device drivers on a Windows PC.