Blackberry Key2 Autoloader 'link' 〈2026〉
Connect the KEY2 to your PC and switch it to fastboot mode (often achieved via reboot-bootloader in the menu).
Practical, step-by-step overview (concise) blackberry key2 autoloader
This is the trickiest part. You need to force the phone into a special mode to accept the new software. Connect the KEY2 to your PC and switch