BlackBerry KEYone Stuck in Bootloader Menu: A Comprehensive Guide to Fixing the Issue
it typically indicates the device cannot find a stable operating system to boot or is being forced into this mode by hardware or software triggers Immediate Recovery Steps
: Plug the phone into a high-output charger or power bank and try to boot. If it progresses further while plugged in, the battery needs replacement. Corrupted OS (Reinstall Firmware)