I'm currently running ios 4.3 on iphone 4 with 04.10.01 baseband.

I need to update it to 5.0.1. Now what i've learnt is that i have to update to 5.0.1 only with custom ipsw to preseve my baseband. I have successfully created an ipsw with sn0wbreeze but when i try to restore in normal dfu mode, i get error 1602. If i put in dfu with ireb, i still get error 1604.

No i have tried updating itunes, restarted computer and also tried with a different computer.. still no joy. Any ideas?