i just jb my 3gs with blackrain and installed cydia, worked great. starting to install bossprefs and now it on reloading data, for like 15 min! i cant shut it of..
I restored to last backup and rejailbroke it when mine did that. Some say you can hold power and home buttons in at the same time and it will reboot. Didn't work for me though.
Jailbroke my 3gs, installed BossPrefs and it hung at the Reloading Data. Or something, it had been working for like 15 min. I have like a filled 16gb iphone, maybe it takes such a long time? Well, I did the homebutton and powerbutton and the apple logo was stuck a a looooong time, but at last, it did finish, and everyting works fine for now. So this was a false alarm.