Thread: IMPORTANT! If you want HELP in case of a bricked Garmin device, please follow this

Originally Posted by Alfiogigio

I know how to use Hex Editor, unfortunately ergn is found only once,
in a position where it makes no sense to me (at 00886a7e0e).

That doesn't sound promising. You could also try to edit the firmware yourself if you can find map file extensions mentioned in it. Changing any instance of ".IMG" to say ".XMG" does work with Garmin proprietary-OS firmware as a 'cure' to prevent loading maps. I can't say such a thing will work with Linux based-OS firmware and it may even 'brick' the device more seriously so all at your risk. Of course if that does work in the same way as 'normal' firmware, once the edited RGN is flashed in preboot no maps will be loaded on attempted boot and Mass Storage Mode might then be available to the device. Someone with Linux software experience might read this and comment hopefully, as that's only a stab in the dark guess.