If you can navigate the bootloader menu (using Volume Up/Down to move, Power to select), do this:
If the phone keeps returning to the bootloader, a corrupt system cache might be the cause. You can clear this without losing your personal data: blackberry keyone stuck in bootloader menu
But as the setup wizard asked him to select a language, Adrian smiled grimly. He tapped English (United States). Then Next. If you can navigate the bootloader menu (using
If a factory reset doesn't resolve the issue, you may need to flash the stock firmware: Then Next
The BlackBerry KEYone, while a cult classic for physical keyboard enthusiasts, frequently suffers from a "stuck in bootloader" (or Fastboot) loop that essentially turns the device into a paperweight without significant technical intervention The "Stuck in Bootloader" Experience
The KeyOne has a sealed battery, but you can simulate a battery pull.
If the device boots to a battery icon but refuses to load the OS, the issue may be power-related. Aged lithium-ion batteries often suffer from voltage sag. The KeyOne requires a specific voltage threshold to boot; if the battery is weak, it may show a charging icon but never actually accumulate enough charge to trigger the bootloader. In this scenario, leaving the device to charge for a minimum of two hours on a high-amperage (2A+) charger is essential. If the battery is removable (which it is not on the KeyOne), this would be the point of battery replacement; for the KeyOne, a failure here indicates a potential hardware repair is needed.