Downgrade from ios4 to ios3 or 2

Hello,
I recently updated my ipod touch 2g to ios4. It has been working fine for weeks until recently it has been becoming slow. I have attempted to Shift-Restore with a restore package of 3.1.2 with no luck. I keep getting errors 20 and 3194? i believe.
I have tried all support forums with no luck, also all fixes too.
My usb drivers are ok, i have restarted my computer, I have tried all the recommended apple fixes also.
any help would be appreciated. Thank you.

I found out how to fix it.
Do a total restore in os4,
sync it to a friends computer and set it up there.
bring it back to your computer and when itunes detects that it does not belong to your library.. cancel and put the itouch in DFU recover mode... so that the screen is totally blank but still on. then just shift-click-restore it to 2.2.1. fixed.

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