Thread: Garmin eTREX 20 working as an eTREX 30

I've found something that looks like a region table, but it's very different from ones from other firmwares. It's not static, instead it's constructed dynamically.
Unfortunately, I don't have the device and I don't have time for this currently. Maybe in a month I will be able to continue... If you want, I can share the IDA database with all my findings.

Also I don't know anyone who has ever patched the region handling stuff for any device.

I only know USB commands for dumping regions (0x60, only supported by old devices) and for flashing regions (0x4B, supported everywhere, is used by updater.exe and WebUpdater, flashing some regions is disabled by flags).


UPD:
Also while working on this [Only registered and activated users can see links. ] I've found the region table and the table which disables reading/writing for regions. Also 296C's ramloader supports 0x60 command. Also the region handling stuff there is different from one for eTrex 20/30, as I said.