Oct 24 2011
A lot of current iPhone 3GS or iPhone 4 users are using a Carrier locked device, having unlocked it using Ultrasn0w want to try out iOS5.
iOS 5 will upgrade your current Baseband thereby leading you to lose your Unlock.
Fear not, the latest build of Redsn0w will allow you to easily preserve your Baseband while still upgrading the Operating System to iOS 5.
The steps are fairly simple. Follow the guide below:
Things you’ll require:
1. Open up Redsn0w and Click on Extras.