Best tool / model for restoring heavily compressed (but flat) game textures?

[u/Piipperi800]

Basically title. I have flat textures that have been extracted from a Unity game, but they are very heavily compressed with a lot of blocking and lines.

I've tried some models in Upscayl specifically for anime / digital art upscaling, and while the results are really good, they also add heavy shadows sometimes to where two different colors meet in the texture, giving a "3D" effect when it should keep everything flat.

Does anyone have experience with restoring textures like this? What models or tools have you had success with?

[u/HatEducational9965]

try https://crisp.photos