From bootloader menu:
From recovery:
First, what is this screen? The bootloader is the first piece of code that runs when you turn on your KEYone. It’s responsible for loading the actual Android operating system. When you see the bootloader menu, your phone is waiting for a command—either from you (via volume keys) or from a computer (via a USB cable). blackberry keyone stuck in bootloader menu top
Common variations of this screen on the KEYone include:
The word "top" in your search query likely refers to the menu being locked at the top of the screen, unable to scroll, or simply describing the visual layout of the fastboot interface. From bootloader menu:
If your device boots but still gets stuck in the bootloader menu, a factory reset might help. Note that this will erase all data on your device.
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. From recovery: First, what is this screen
The most common reason for this screen appearing unintentionally is a stuck button or an accidental key combination during startup. The KeyOne is designed to enter this mode if Volume Down is held while the device powers up.
Before fixing, understand the cause. This prevents future recurrences. Common triggers include: