In TWRP, wipe Dalvik, System, Cache, and Data. Do not wipe Internal Storage if you have the ROM saved there.
While early versions were "tethered" (requiring a PC to boot), current methods allow for a standard, untethered experience. blackberry key2 lineageos
If you are looking to purchase a device specifically for this project, here are the current market options as of April 2026: BlackBerry KEY2 (Standard/Red Edition) Go to product viewer dialog for this item. In TWRP, wipe Dalvik, System, Cache, and Data
While the port has reached a "usable" state for enthusiasts, it is not yet perfect: current methods allow for a standard