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[AlexTheCat123]

I just stuck a set of C ROMs into my 2/5 (which is actually what it came with when I first got it, interestingly enough), and I can reproduce the issue!

It tries to boot the first time around before hanging a while into the startup process, and I think it would probably boot fully if I had I/O ROM 40 installed. But regardless, there's lots of disk activity and we get the inverted cursor at the bottom-left of the screen before it hangs, meaning that the OS is fully loaded and running. But then when I reboot, I get the PROFILE READ FAILED error just like @ried does.

I vaugely remember something coming up about weird behavior under the C ROM a few years ago (maybe somebody emailed me about it), but I think they just ended up switching ROMs instead of asking me to try and figure out the actual problem. Maybe this is a good time to actually look into it!