I got a hold of a 3GS (new bootrom) that was on 4.0.2 and decided to simply downgrade to 4.0.1 to simplify the JB/unlock process. Along the way, I encountered some errors (1600) that didn't let me downgrade, which prompted me to use iREB to bypass the errors. The restore loaded fine but now I'm stuck in DFU mode? Any ideas? Thanks!