I lost all of my badges logging into Pretendo, and trying to acess the arcade deleted everything... Using GYTB I got the stuff I was actually using back, plus some custom badges!
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what is gytb?
I tried GYTB but it refused to restore my badges
GYTB lets you turn any 64x64 png image into a badge. So I just found images of the ones I used before. It's in the Universal Updater, but you need to put a folder named "badges" at the root of your SD card
same thing happenedto me :P