BlackBerry KEYone is stuck in the bootloader menu (often displaying black text on a screen), it typically means

is stuck on the "BlackBerry Bootloader Menu" (often labeled with "top" in its menu structure),

• A Windows PC.
• A high-quality USB data cable (the original BlackBerry cable is best).
• ADB and Fastboot Tools installed on your PC. (You can download the "SDK Platform Tools" from the official Android developers site).

Select "Continue" or "Start"

: Use the Volume Up/Down keys to highlight "Continue the bootup" or "Start" and press the Power button to select it.

Part 3: Step-by-Step Fixes (From Easiest to Most Advanced)