If the factory reset doesn't work, your KEYone's operating system is likely damaged beyond a simple wipe. The solution is to completely reinstall the OS using a tool called an "autoloader." An autoloader is an official executable file created by BlackBerry that reinstalls the entire operating system via a PC.
: Failed attempts to use a Mobile Upgrade Tool or autoloader can leave the device in a semi-permanent bootloader state. III. Resolution Strategies blackberry keyone stuck in bootloader menu top