well, tuff to get info out of you, lol
Put the phone in DFU mode, battlecrushr gave you a link to help you here. (DFU mode is a blank black screen)
In the gray header bar above ^ you will see a link that says "Guides" choose your firmware you want, I suggest 3.1.2, download it, and also the jailbreak if needed from there.
For firmware, go here.
On a PC, hold "Shift" and click restore, point to the firmware that you download, let it do it's thing and restore, then jailbreak if needed.
Last edited by blkcadi; 02-19-2010 at 08:54 PM.
Reason: Automerged Doublepost
Download the firmware, Put the phone in DFU mode, then hold the shift button on your keyboard and click restore in iTunse and point to the firmware that you downloaded. Let it do it's thing.
you never know, corrupt file, an app that you installed. It's not uncommon and no big deal. It's good to clean the phone OS out and install new anyway.. It will run better.