I have seen only a handful of people pull this off i have redsnow and i used redsnow to make a firmware with no Base Band so i can keep mine (1.59.00) so i can use ultrasnow to unlock. But i am nervous to upgrade from 4.0.1 to 5.0.1 in fear of losing my phone and not being able to unlock. Does anyone have tips or has anyone done this before and can walk me through it? I've heard alot of issues with jail breaking the new os..

Iphone 4 32g 4.0.1 want to upgrade to 5.0.1

Using redsnow

Windows 7

Thanks!!