(TWRP or LineageOS Recovery .img file).
Once the phone enters the fastboot screen, check the connection: fastboot devices Use code with caution. Execute the unlock command: fastboot oem unlock Use code with caution. blackberry key2 lineageos install
Note: You may need to use fastboot flash boot recovery-athena.img if the recovery partition is locked. Step 3: Install LineageOS via Sideload (TWRP or LineageOS Recovery