I tried to clear and delete everything last night on my premiere and after 15+ hours if it sitting on that screen, I finally rebooted it. Ended up booting back to clear and delete state. Tried the various KS codes but couldn't work the magic to get it to flip over and activate KS mode. Finally I called TiVo and the tech said - the bricking is a known issue that was reported as early as February 2020. He said they're working on it and they don't have a resolution on it right now. His instructions to me were to do a cold boot (unhook everything for 24 hours then call back) and we'll go from there. Sharing what I've heard. Not sure how widespread the issue is.