Bit late, seeing as how you fixed it and all, but for future reference, if you have a captial T on the name of the folder (themeXX) then it's not picked up. Was tearing my hair out about that for hours.....
I am trying to hack Fire Emblem Warriors on my 2DS XL, I have been trying to get it to work, but I need some extra help figuring it out. I have HEX codes, and a possibly outdated plugin, but I dont know how to implement them