intuicion
Quote Originally Posted by intuicion View Post
I think it's compressed in a different way, not encrypted
Why then is the size of the "compressed" file larger (+ 556 bytes) than the uncompressed file?

Quote Originally Posted by intuicion View Post
for example fenix6 uses a very different hardware chip for example, but gcd is the same
What do you mean ?

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If I understand correctly, you made rrgn dumps on the device with firmware version 3.00.

But region 144 contains an encrypted binary file FW_ALL.BIN from GCD version 2.70!
I wonder how it got there? Is this a backup of a previous firmware version?

What version of the firmware was the device originally equipped with?
Did you upload firmware version 2.70?

Could you roll back the firmware to version 2.70 and dump all regions again?
To figure out the encoding method, we need as many "encrypted-unencrypted" file pairs as possible!

By the way, where did you download the firmware for Alpha 200? I could not find it either on Garmin's site or Perry's site. WebUpdater?