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How to fix the "you are not the creator of this beatmap error"

0) Make sure your mp3 doesn't start with a number (like "09 - aaa.mp3)
1) copy all the .osu files, bg, mp3, tags, etc. of the map somewhere
2) create a new map with the same mp3
3) set the metadata, background etc of the new map
4) create empty difficulties for every diff of the old map
5) copy everything from the old .osu files EXCEPT Metadata into the new one
6) submit (if bss actually works)