Personally I don't think that was a good trade because 3.30 oe is better than $ony's official 3.30 because the oe can run homebrew and ripped games using Autopopstation.
You can downgrade up to version 3.03 but that requires the unpatched version of Liberty City stories. Yes they are trying to find a way to downgrade versions 3.10 and up but they need to find an exploit first which takes time.
I hope I helped. If he have anymore questions feel free to ask them here in your thread.

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