hey i jb my iphone 3gs 3.1.2 yesterday and today it crashed during the day so i tried to reboot it using blackra1n, but what happens is it goes to geodude's picture and gets that processing circle in the middle and gets stuck there. it eventually goes back to the apple logo and goes into recovery again. i tried redownloading blackra1n a couple of times but nothing changes and i cant restore because it'll upgrade to 3.1.3 as i didnt send my shss to saurik's server because i planned to do that today but never got the chance.
Same thing happened to me brand new 3.1.2 , used redsnow and everything worked as planned , rememeber to have stock 3.1.2 firmware ipsw on your computer otherwise it wont work .