I'm in need of a little help with my friend's Gamin Oregon 400t and 450i. I've been reading hours of solutions for "system file missing" issue, and finally arrived on this site. It seems like, I need to enter my devices into pre boot mode....which I cannot achieve. I've tried the the way it was suggested on this page (Hold down power button at startup) all it does is, that it shows the garmin logo for about 30 sec. then it shows "system file missing" then turns off. As I understand, this is a necessary step in order to use GarminCure. If anyone could give me advice how to enter pre boot mode on these devices, I'd greatly appreciate it. (does the unit needs to be connected with usb cable while I'm pressing power? Does the external memory card needs to be inserted?
Thanks, for any advice you can give me!