Issue with extracting from a .CPK file (PSP ripping)

[Kyougi Ryu]

So today I decided to try ripping from Steins;Gate Hiyoku Renri no Darling, a PSP game.

All of the game's resources seemed to be stored in two .CPK files, DATA0.CPK and DATA1.CPK. Running them through QuickBMS with the CPK script gave the error "not a @UTF table at 16". I googled around and found another program that was made for some Valkyria Chronicles game that was supposed to deal with it, cpk_unpack.

The two DATA CPKs extracted fine with it and inside them are a bunch more CPK files. Trying to run them through QuickBMS gives the same error as before, and cpk_unpack now does nothing with them. Anyone know what I should do next?

[John2k4]

I believe I remember either RTB or Segtendo talking about CPK files over on Smashboards..Have you tried running them through [urlhttp://oasis.xentax.com/index.php?content=home]Noesis[/url] to see if they are in any kind of recognizable format?

[Kyougi Ryu]

Noesis can't seem to extract anything from the files, but that seems to be because it was made with ripping models in mind (or at least that's what I grasp from the website), and the game I'm trying to rip from is a 2D game.

[Dazz]

Noesis can also extract certain archive types.

Have you tried running Gitmo on it?

[Kyougi Ryu]

Ran all the CPKs through Gitmo and double checked them with Noesis again. Still nothing =/

[John2k4]

Can you open one of the unpacked files in a hex editor, and see if the header says anything? I've been able to get a couple Wii games to open by noting a LZ77/LZMA header on their unknown files..

[Kyougi Ryu]

Sorry for the late reply - I opened up the CPKs in a hex editor like you suggested, and it looks like they all have the same header, which just seems to be for CPK.

[TGE]

Maybe it's CRI?