Thread: New garmin gcd

Hi, I'm somewhat confused about your post. Is the files readout by rrgn not encrypted.
I own a Instinct Solar watch, unlike Instinct without solar, a entropy test revealed the GCD firmware file is encrypted, but I would be interested if I can manage to dump the unencrypted content from the watch using rrgn. And (hopefully) I can then find out how the GCD firmware is encrypted. My watch is too compact to have a SD card slot, and there is only 4.5MB space left, so I'm not sure whether I can do the same rrgn dump. Could you please share the rrgn dumped file and I can try my luck with GHIDRA, it's possible that the way garmin encrypts the firmware is the similar with different devices.

Originally Posted by zheru

Could you please share the rrgn dumped file and I can try my luck with GHIDRA

You can explore Montana 700 rrgn dumps:

Code:

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Thanks to rx9jc from gps-forum.ru.