Garmin started to encrypt their firmware files. It started with the MARQ/Fenix updates and now also the firmware for the zumo XT is encrypted. Does anybody know anything about that? The MARQ/Fenixes encrypted binaries (inside the GCD) all start with 28 xx xx xx where the xx might indicate something. After that, the encrypted(?) firmware follows.

The zumo XT update now breaks with the GCD/RGN tradition and is a file *.update.signed which is actually a tar archive that contains various encrypted files. Only the file "version" is readable and contains the firmware version.

Any more info is appreciated!