I'm pretty sure if you combined the data of the update and the game, you should be able to build a CIA of the merged flies. What method do you use to run your mods? SaltySD or something else?
For some reason I can't extract the data for RomFS of Update. The cmd would always tell me syntax error even though I entered it exactly as shown. I have Python but it just won't work. Any idea what I'm doing wrong?