DogeBarks

Yup, making patch1.xp3 or patch2.xp3 works just fine, thanks for the help!

I was about to make a topic about that, before noticing this. To answer your question... Kirikiri2, under tools, has an application called "krkrsign.exe" which makes those .sig files. However, when making a .sig file for my patch, the game simply returns "Invalid Input Packet". I even remade the .sig file for the original data.xp3 but with no success. The weird thing is that, upon making a patch for yet another game (Devils Devel Concept), which also uses .sig files, it patches the game with no problems at all, even if the patch.xp3 is the only one missing a .sig file, both use kirikiri engine, yet while Devils Devel Concept does not care that my patch.xp3 has no sig, that other game instead returns a missing .sig file error. If anyone has any idea from what it depends and how to solve this problem, it would be plenty of help!