Maybe you'd like to load the 37xx firmware treated with [Only registered and activated users can see links. ]. It's intended to enable all possible features in 3750/3760 so it might do something to your (now) 3700. I've had no experience with it used in an actual 3700 which i think was a regional European-only device, so I don't know what it will do to your device and it's all your risk if you try it. I haven't read that thread for years but i do recall there was conflicting info whether it worked in fw later than V4.90. If you want to try it, the original V4.90 is available here to patch:
Code:
Please Login or Register to see the links
Otherwise, you can go straight to erasing region 41 and cross your fingers that works, details about flashing text commands from SD using boot.bin as Ldr.bin are here: [Only registered and activated users can see links. ]. This is the command to use in Garmin\Updater\1101\update.txt:
Code:
Please Login or Register to see the links
Backup nonvol with rrgn command first of course.