No matter what I try I an stuck on UI 4.6.2. It doesn't matter if I change firmware to an older version or a newer version. This became a problem after trying to install one of the very early 5.x betas many months ago. I've reformatted the SD card. I've tried the 30 second full reset. What do I need to do to fix it? I'm OK with a complete wipe if that's what it takes