There is no downgrader for 3.10 yet, so here is what you do - sit in a corner, play the games you have, and DO NOT UPGRADE EVER AGAIN. In time a downgrader will probably come out, but not if you keep upgrading.
I upgraded when i first got my psp, and i had to wait about 6 months before i could get down to 1.5...but that was before the golden age of homebrew...you might be waiting a while.
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