hi, it is a standard header of rgn file.

Code:
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it is a boot region of etrex20/30.
0A B2 0A 00 = Lenght region +0xa
52 0c 00 = Region 0xC = boot
10 27 00 00 = i dont know, it is important?
00 B2 0A 00 = Lenght region

There is no byte that indicates the version of hardware and software, at the head of rgn file?
there is any checksum?
10 27 00 00 ?
Regarding the files mentioned in previous post, firmware Fenix3 indeed is a region in another region, then there is the firmware that has a different header than normal. I have not looked yet, when I have time I give a look.

The problem of finding the signature at the end of the GCD files already corrected. thx