Steps to attempt recovery (ordered, with risk notes)
If the device shows up in fastboot devices , you can attempt to flash critical partitions manually if you have the factory image files: fastboot flash boot boot.img fastboot flash system system.img 2. Check Device Drivers
BlackBerry KeyOne Stuck in Bootloader Menu — How to Repack and Restore Firmware
Use a reliable USB Type-C cable connected directly to a motherboard port on your PC (avoid external USB hubs). blackberry keyone stuck in bootloader menu repack
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An interrupted Over-The-Air (OTA) update.
Connect your KEYone to the computer while it is stuck in the bootloader menu. Run Autoloader: Run the .exe file as an Administrator. Steps to attempt recovery (ordered, with risk notes)
Android devices automatically launch into the bootloader menu if a volume button is held down while powering on.
Look for an entry with a yellow exclamation mark named "Android" or "BlackBerry".
Note: Do not unplug the cable or close the command prompt window during this process. The process can take anywhere from 5 to 15 minutes as large system images are transferred. Step 4: Manual Flashing (Alternative Method) This link or copies made by others cannot be deleted
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The Volume Down key might be physically jammed or shorted, forcing the phone into the bootloader on every start. Clean the button housing with isopropyl alcohol.