Earlier today we told you on how you can downgrade you iPhone and iPod Touch, the solution to downgrade from iOS 4 to iPhone OS 3.1.3 is pretty simple and straightforward and does not require much work.
Users have been downgrading their iPhone or iPod Touch because of the several problems which are caused by the new iOS4 update on the iPhone and iPod touch, including battery drains and more.
We have been getting a lot of comments with regards to people draining the battery level because of this issue, you can read all the comments here, here and here to find out the different problems iOS4 has been causing for users.
If you are one of the users who have been affected by this problem, you can read our earlier guide on downgrading iOS 4 and using iPhone OS 3.1.3. Once you do that, you can also jailbreak your 3.1.3 device using the Spirit jailbreak.