(XDA threads):
You need stock firmware (autoloader) from XDA or BerryCloud. blackberry key2 custom rom
The KEY2 comes with heavily integrated BlackBerry Hub+ suite apps that can slow down the aging Snapdragon 660 processor. You can safely disable or uninstall these system apps using a computer and ADB commands, freeing up RAM and battery life. Enable and USB Debugging on your KEY2. Connect to a PC and open a command terminal. (XDA threads): You need stock firmware (autoloader) from
If custom ROMs sound too risky, there is a middle path. You can stay on the stock Android 8.1 but aggressively strip it down. blackberry key2 custom rom