Stuck in Bootloader Mode - BlackBerry Priv - CrackBerry Forums
Use the original BlackBerry Type-C cable or a high-quality data-certified equivalent.
An "Autoloader" is a self-extracting file that contains the full OS and the tool to flash it. It "repacks" the OS onto your phone. blackberry keyone stuck in bootloader menu repack
Look for an entry with a yellow exclamation mark named "Android" or "BlackBerry".
The internal storage chip may have entered a read-only state, preventing the new firmware from actually saving to the device. Stuck in Bootloader Mode - BlackBerry Priv -
Do not skip this. If your KEYone is stuck in the bootloader menu, you cannot boot into Android, but you can still use Fastboot.
If you have successfully flashed a clean Autoloader and the device still returns to the bootloader menu, you likely have a hardware fault. Look for an entry with a yellow exclamation
We'll move from simple solutions that sometimes fix the problem to the more advanced "repack" method.
Recommendation
qcomview --flash rawprogram0.xml --device COM5
While detailed tutorials are complex, the basic concept involves taking the raw system files from an official source (like the BlackBerry Mobile Upgrade Tool) and using a tool like Autoload-DevAlphaC.exe from BlackBerry’s developer resources to compile them into a new .exe file.