Well, I finally updated my 3.1.2 jailbreak last night since my iTunes wouldn't back up right, and now I want to re-jailbreak, however I can't get my touch into DFU mode thanks to no working sleep button. Before when I was jailbroken I was just using an app to lock my touch, but now that won't work. Any suggestions?
1. Acquire an .ipsw (4.2.1 for ipod touch 2g) for your device. Download here.
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2. Rename the .ipsw to .rar and open the .ipsw in WinRAR (or an equivalent file browser). Do not extract it!
3. Navigate to Firmware/all_Flash/all_flash.n72ap.production, copy out the applelogo.s5l8720x.img3 file, rename it to LLB.n72ap.RELEASE.img3 and then overwrite the LLB File with this.
4. Exit out of the editor and change the extension back to an .ipsw
5. Then Restore your iDevice to the modified firmware and it should kick it into DFU mode! (With maybe an error or 2 :S)
Have any questions feel free to ask... just quote me so I can respond faster..