If the issue persists, you may need to flash the bootloader:
If your device doesn't boot properly, you might need to use hardware key combinations or specific software tools provided by BlackBerry or third-party developers. Always ensure you have backups of your data before performing such actions. blackberry keyone stuck in bootloader menu top
If your device is recognized by a computer, you can try using ADB (Android Debug Bridge) commands. If the issue persists, you may need to