If you decided to unlock your iPhone 4, 3GS on iOS 5 so you have two ways the
- First way: is to use Ultrasnow 1.2.4 which has released by the Dev- team to unlock iPhone 4, 3GS on iOS 5 which supported these baseband 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00.
- Second way: is to use Gevey SIM in order to unlock iPhone 4 on iOS 5 Gevey Sim supported baseband 01.59.00 / 02.10.00 / 03.10.1 / 04.10.1 but notes if you have an iPhone 4 that is currently unlocked with a Gevey SIM card, you can unlock your iPhone on the iOS 5 firmware with the same Gevey SIM card as long as you preserve your baseband while updating to the iOS 5 firmware. So the difference between UltraSn0w and the Gevey SIM card, is that UltraSn0w only supports a limited number of older basebands while the Gevey SIM card supports a limited number of newer basebands.
Download Required:
- Download iOS 5 firmware
- Download iTunes 10.5
- Download Redsn0w 0.9.9b5
How to preserve iPhone 4 baseband guide
STEP 1: Connect your iPhone 4 into you computer then open Redsn0w 0.9.9b5.
STEP 2: Now select Extras then “Custom IPSW” option so that you can create your pre-jailbroken custom firmware.
STEP 3: Redsn0w will start cooking your custom IPSW and you’ll get it in few minutes.
STEP 4: Once you get your firmware, select ‘Pwned DFU’ from RedSn0w.
STEP 5: Follow the on-screen instructions to get your iPhone in DFU mode.
STEP 6: Once it’s in DFU mode, close Redsn0w then open iTunes 10.5 downloaded above and you should get your iPhone in Recovery Mode message.
STEP 7: Now hold the Option key on Mac and hit Restore. Point iTunes to your iPhone 4 Custom iOS 5 IPSW which begins with NO_BB. (WARNING: Don’t select the stock one or you’ll lose your unlock)