i have sucessfully jailbroke a iphone 3.1 i dont recommend everyone goes and updates to 3.1 its very shady once done but works. have you tried it yourself, i fix alot of these that people bring me and got to play around with 3.1.- not impressed

redsnow does jailbreak 3.1 just use the old version of redsnow and itunes 8.2 unlock wont work.

i dont know if you ever not payed attention to where sources are coming from there pal. and yes i searched for it on this iphone its not there. go ahead and uninstall your unlock and try to add it ;) youll see... looks like its up but not pulling from the server. i own a server i know that something is def screwy here ....

well i just tried it the line moves like its installing then i get a nice 404 error ispaziorepo not found ahh well i have to go to bed anyways maybe tomorrow :) i sucessfully downgraded this iphone yipee!

you realize there is no rules tied to a 2g you can feed it any ipsw and it seems to take it.redsnow 0.7.2 is flawless use that instead of 0.8 and you should be good to go. may want to take it in itunes hit restore before to have a clean process.

hey i just sucessfully downgraded took me 4 hours but hey its done!! now theres 2 things i did not sure what
one did it.
i plugged the iphone from a mac to a pc acted weird for a bit had 3.1 so i fed itunes 3.0 by force the real apple 3.0 not altered one.ok so then i used itunes 8.2 used old redsnow 0.8 which is very slow but worked.redsnow does stop during reboot 2nd process just unplug usb fast and replug in and it keeps going.
now i read that redsnow locks up at the end how i fixed this was to keep itunes open during this whole process and bam looked at version 3.0 it says now also itunes says want to update to 3.1? heck no so there you have it. now if ultrasn0w source was working i can confirm a unlock everything else so far is working excellent.

in dire of ultrasn0w repo working!!! been down a few hours and im trying to get this phone unlocked!!!!!!!

hehe add this source www.hackulo.us then go and find installulous and install that it makes a green icon on your screen have fun ;)

after reboot make sure the source is in there and working, if it is may want to unistall the source then readd it and try again.

really dosent matter just dont open up itunes till after redsn0w is done and then sync up.