I would just go for 3.50. The downgrader will be out in a couple of days.
http://dl.qj.net/PSP-Firmware-3.50-(...3840/catid/163
Place the eboot.pbp in psp/game/update.
Then on your psp go to game-memory stick and run it from there.
And yes, your fine overwriting 3.10
Now hurry and get a copy of lumines so you can downgrade!
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