Update: Tried a factory reset. Only difference I noticed was the annoying button beep. LOL I ran a fresh shortfuse hack, and attempted to redo the update to no avail. Put Testmodekey on an SD card and went into directory for user, but the PRG.FLG file wasn't there. I watched the YouTube video and saw it clear as day on his screen, but mine was missing. Any other ideas?
At this point, I'd be willing to deal with 2010 Maps if I could get the system back to original before the 2012 & 2017 updates. Or maybe just find a way to reinstall the 2012.
OK, I didn't realize you'd installed the 2012 update. That's why no PRG.FLG file. The unit has two sets of files under USER. PRG0 and PRG1. Initially they are identical copies and PRG0 is the "active" one. Each successive map/app update alternates between the two directories. So 2012 overwrote PRG1. And 2017 overwrote PRG0. The way the boot loader knows which one is "active" is by the absence (PRG0) or presence (PRG1) of PRG.FLG.
Initially PRG.FLG didn't exist, so PRG0 was "active". When you installed 2012, PRG1 became "active" and the installationer created PRG.FLG. Then you installed 2017, which overwrote PRG0 and deleted PRG.FLG.
PRG.FLG is just an empty file. So you might try making a file on your computer and copying it to /USER. It is worth a try, and if it doesn't help, it can easily be undone.