@turboccc
Look at this: [Only registered and activated users can see links. Click Here To Register...]
I don't know when the signature was introduced.
And I don't share your optimism because Garmin can easily sign everything and even on old devices. Then we will be flashing firmwares through broken IMG files causing buffer overflows. Notice that buffer overflows are not easy on ARM because of existence of I-cache and D-cache.
Then also we will have to forget about cure firmwares.
As for me, I'm already suffering from the signature because I need flawless and easy update of patched firmwares.
@lolypop000
If you could break properly implemented digital signatures you'd already be a famous cryptographer.