Would this help? Apparently some japanese guy wrote a program to repack UPK files, which are extremely similar to Tera's GPK files.
https://sites.google.com/site/0dd14lab2/upkpacker
UPDATE: There's a new version that explicitly lists support for Tera GPK files. Seems to work with all of them now, and unpacking a file followed by repacking it works fine (the file loads in the game no problem). I'd try changing some of the textures, but have no idea how.
This is pretty old but I have been trying to figure it out and wondering if anyone else had some experience with it..
The problem is that the texture files unpacked are in a Texture2D format I've never seen and I'm unable to open/edit them.. Tried swapping tga/png/dds files just by changing the extension and repacking them but still a no go so far.. Umodel unpacks the texture files as tga and psk which are workable.. Just need to know how to swap those back to Texture2D and repack it..
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