The oothax installer will install payload from 10.7.0-32 which just renames it to work on 11.0.0-33 if i can remember, the latest payload does work on 11.0.0-33 but very low chance. There is a thread on here with a updated save and payload that will make it fully functional instead of low chance. If i can find it to share....
Its simple save and payload files that just need a homebrew save manager like fbi installer to transfer.
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So the instructions say to copy the already existing save on your game cart to the powersaves folder on your pc, then rename the file to something else and then copy the hax save to the same folder your powersaves is in and rename the hax save to the original file name you renamed the first save to before you renamed it. Then you should have the save file HAX******** on your oot game card.