Installing BlackBerry KEY2 has long been considered difficult due to the device's locked bootloader, but recent community efforts have made unofficial builds of LineageOS 22.2 (Android 15) available. Current Status and Compatibility April 2026 , there is no official support from the LineageOS project
fastboot flash recovery twrp.img
As for the KEY2? Keep it as a time capsule. Use it as a dedicated writing device on airplane mode. Or debloat it and accept its security flaws. blackberry key2 lineageos install
Before you start, make sure you have:
You are now in the LineageOS Recovery menu (blue background). With your bootloader unlocked, install TWRP using Fastboot