How to downgrade from 4.0gm to 3.1.3?

[capn7]

Some of my apps are not running correctly so I'd like to downgrade but I don't know how. I'm running a generation 3 ipod touch.

[iThinkergoiMac]

Do a restore the normal way...

[CBeckstrand]

Use this (http://www.ihackintosh.com/2010/04/downgrade-iphone-3g-os-4-0-to-3-1-3-or-lower/) guide. A normal restore will not work.

I downgraded my 3g touch because I could not connect to either of my wireless routers with 4.0.