Thread: New garmin gcd

I downloaded the GCD-file for Montana-700,

Code:

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unpacked it using RGN-tool.
You're right.
It looks like the binaries it contains are encrypted or compressed.

I found and downloaded an archive with the same firmware version (6.40) for the same navigator.

Code:

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The archive contains both RGN and GCD files.
Extracted binaries from RGN and GCD - and binaries matched!

Originally Posted by intuicion

Also on some devices fw_all.bin is written on rgn 144

What devices?
I can't find anything about this "Region 144".
Perhaps this region is used as a "temporary folder (region)" for storing the binary file before unpacking or decrypting it.

Originally Posted by intuicion

but cannot be written to room rgn 14 because it is filled with zeros.

Then I'll expand my query:

Could you share the rrgn dumps of region 14 (and/or 114 as well)?

Originally Posted by VadimK

I can't find anything about this "Region 144".
Perhaps this region is used as a "temporary folder (region)" for storing the binary file before unpacking or decrypting it.

I am not in the same decision as you, Rgn 144 appears blank on different devices of the same type

I guess it makes more sense to examine the boot and xloader with ida, check your pm for files
I have reviewed it many times, I could not understand, maybe you will find a meaning