ability to extract/replace/etc type 0x62 'BIOS Binary' images. about psptool

[hanetzer]

for reference's sake: said image has a 256-byte header on it.
I've only personally observed one field in said header to be used,
which is 'size' (unsure if compressed or decompressed), which is
a 32-bit field (4 bytes) at address 0x14.
after this header is the real meat and taters of data, which is a
zlib-compressed stream of data.

[Ragebone]

I am unsure what exactly you mean, but up until rome, those entries have been pointing at an actual UEFI volume which can be looked at and extracted with Uefitool.
Only with Threadripper Pro i have seen it be weirder.

[hanetzer]

Yes, but PSPTool does not even say 'hey, there's a type 0x62 entry here'.
In this case, on the Asrock X370 Killer Sli/AC bios image (X370KLA7.30 in my case),
the image is not 'just' a flat UEFI volume, but instead, a zlib-compressed one, with a
0x100 byte header affixed to it.

[hanetzer]

Ah, so I went thru all older versions of the X370KLAx.xx bios images, and it turns out they only started using
the compressed UEFI volumes as type 0x62 entries starting with the 7.x versions; 6.00 and prior all appear
to use uncompressed images and parse fine with psptool.