I have had the unfortunate experiance of being forced to update to 3.1.3 I have a brand new 32G 3Gs which has teathered only jailbreak. This was no problem but I installed some things from Cydia that needed a reboot. This is normaly not an issue, but I had the phone pluged in to my MBP and iTunes was open. What happened next was freak and rare but I thought I should warn everyone just in case. When the unit rebooted I did not get the normal usb restore screen. I got the glowing black DFU screen. Nothing I ran would restore or get me out of it. Trying to restore even the original 3.1.2 from apple resulted in the nice error that my phone was not authorized for that version (the usual downgrade error). After spending 6 hours trying to figure out a way out of DFU (in hind sight I should have just let the battery die and hoped for the best) I ended up letting iTunes download and install 3.1.3 It's sad because at this point with the newest everythign I have no way to go back. I miss my 5 column springboard and 5 dock icons already. I know the brilliant guys at dev-team will eventually have a solution for me, but in the mean time I seem to be stuck. Let my mistakes be an education to you so you dont end up in my shoes.