Cannot decompress partition of new LG firmware

openlgtv / epk2extract

Extraction tool for LG, Hisense, Sharp, Philips/TPV, Thompson and similar TVs/Embedded Devices

GNU General Public License v2.0

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Cannot decompress partition of new LG firmware #102

Open chros73 opened 7 months ago

chros73 commented 7 months ago

Hi, all previous firmwares worked fine so far but the new 13.30.55 branch of LG C2 throws this error:

fakeroot ./epk2extract lib32-starfish-global-secured-o22-nameri.pine-23-13.30.55_prodkey_usb_V3_SECURED.epk
UnSQUASHFS file to: ./13.30.55.01-HE_DTV_W22O_AFABATPU/rootfs.pak.unsquashfs
Filesystem uses unknown compression, this is unsupported by this version
Decompressors available:
        gzip
        lzo

It extracts the rootfs.pak file but it cannot decompress it.

throwaway96 commented 5 months ago

It probably uses zstd.

chros73 commented 5 months ago

Thanks, it indeed does. Installing libzstd-dev package on Debian 12.5 and enabling it in the makefile of squashfs-tools then building current squashfs-tools and running ./unsquashfs rootfs.pak solves this. So, the squashfs part of this project needs to be updated to support zstd.

chros73 commented 5 months ago

May I ask an unrelated question? In the extracted rootfs, there are *.dbx files under /usr/share/pqdb/index directory that suppose to hold some default calibration data (e.g. peak brightness). Do you know what file format that is or which application we can take a look at that data? Thanks

throwaway96 commented 5 months ago

No idea; sorry. If you want to reverse them, I'd start with /usr/lib/libpqdb.so.1.