Random software bugs, cache corruption, or a sudden shutdown can cause critical files to fail.
To rule out a stuck button: Look closely at the volume rocker on the right side of the KeyOne. Is it depressed slightly? Try gently prying it up with a fingernail. If the menu disappears after jiggling the button, you need a physical repair (replacing the volume flex cable).
Understanding why this happened can help you choose the right fix: blackberry keyone stuck in bootloader menu
: Sometimes a specific button sequence can snap the device out of the menu. Press and hold the Power button and then quickly press the Volume Down button; release both as soon as the screen goes black. Common Causes for the Bootloader Loop
If all else fails, the operating system is heavily corrupted. You will need a computer to reinstall the Android software. Random software bugs, cache corruption, or a sudden
If navigating to "Start" fails, try entering Recovery Mode to clear corrupted temporary data.
The most common cause of a bootloader loop on older BlackBerry devices is a mechanical failure. The KEYone enters the bootloader when the button is held while powering on. Try gently prying it up with a fingernail
Clean around the buttons using a drop of isopropyl alcohol (90%+ ) on a cotton swab to dissolve any dirt or sticky residue. Perform the hard reboot from Step 1 again. Step 3: Wipe the Cache Partition via Recovery Mode
If the issue is caused by a malicious or corrupt third-party app, Safe Mode will bypass it.
: Use the Volume Up/Down keys to highlight an option.
To help narrow down the best solution for your device, could you let me know: