Ok, I get it now. Bad .img caused crash in OS that can't be circumvented (unless .img was removed) so you have to get rid of it some how. Entering pre-boot and curing is only solution.
Ah, that is the point, after firmware patching was released, there might be an increase in the return of defective newer models. If I were in charge of Quality control, I would definitely investigate why.
Yes, it restarts and no way to turn off the display when charging. You would think pressing for freaking 10 sec would just turn off the device. I do not know why Garmin had to make it difficult. When a USB cable is plugged in, just prompt the user if charging or disk access. So simple. It wouldn't be as bad if they give you a power adapter to charge, but all you get is a cigarette connector and a USB cable. To charge outside car, you have to use USB cable and risk burning the screen.