Ultrasn0w 1.2.4 for iOS5, Unlock’s for iPhone 4,3g, 3gs
The Famous Dev Team has updated Ultrasn0w Unlock software for iOS5 which is also backward compatible to devices already using Ultrasn0w. Ultrasn0w 1.2.4 is updated to support iOS 5 on iPhone 4, 3g, 3gs with old basebands like 04.26.08, 05.11.07, 05.12.01, 05.13.04, and 06.15.00. The baseband supported for the iPhone4 is 01.59.00.
To use iOS5 usage & keeping your ultrasnow Compatible baseband is to use Custom IPSW. Redsn0w Allows custom IPSW currently supporting MAC systems.
Dev Team gives a trick for the 3gs with 06.15
Note: there’s a special “trick” that iPhone3GS owners with baseband 06.15 need for iOS5. During the new setup screens you see when you start iOS5 for the first time, you’ll be asked about Location Services. Be sure to select “Disable Location Services” when asked! Later on in the setup, you’ll have the chance to turn on Location Services again when asked if you want to use “Find my iPhone”. It’s fine to turn it back on at that point, if that’s your desire (or you can always go in and enable it in Settings.app).
Also, some iPhone3GS users with the 06.15 baseband may have tried to install iOS5 using a stock IPSW (even though you should never ever try to use a stock IPSW if you’re an ultrasn0w unlocker). If you did try this, your baseband is probably in an inconsistent state, and you’ll need to reflash the 06.15 baseband again (using redsn0w). Be very careful if you use redsn0w to reflash the iPad baseband — don’t interrupt the process! And please avoid using stock IPSWs in the future 🙂 Unlockers should never go near stock IPSWs.
If you need to use redsn0w for any of the above tasks, please make sure it’s version 0.9.9b4 or higher, which is available here.
Below you can see iPhone 3gs with Baseband 05.13.04 is using UltraSn0w 1.2.4 & that has fixed UltraSn0w Crashes & some signal issues as well . For all those with Cydia install already can just go to Cydia changes an update Ultrasn0w. But before updating read all the Dev Team instructions