How to Update iPhone 4 (iOS 4.2.1) to iOS 5.1.1 While Preserving Baseband for Gevey SIM
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Trancemaker • September 14, 2012 at 7:20pm
I am using a jailbroken iPhone 4 on iOS 4.2.1 (Baseband 03.10.01), currently unlocked with a Gevey SIM card. I would like to update to iOS 5.1.1 to use newer apps but must keep the unlock status.
Is there a 100% reliable way to update without losing my baseband? Additionally, if I back up my data and attempts to update/jailbreak/unlock fail, can I restore to my previous state, or will a baseband upgrade make it impossible to use my Gevey SIM?
Answers
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mateen • September 14, 2012 at 10:07pm
To update your iPhone 4 to iOS 5.1.1 while preserving your baseband (03.10.01) for Gevey SIM compatibility, you must use a tool like Redsn0w to create a custom firmware (IPSW) that does not include the baseband update.
Follow these specific guides based on your operating system:
Windows: www.iclarified.com/20516/how-to-upgrade-your-iphone-to-ios-51-without-updating-your-baseband-win
Mac: www.iclarified.com/20512/how-to-upgrade-your-iphone-to-ios-51-without-updating-your-baseband-mac
Note: Use the iOS 5.1.1 firmware file instead of 5.1 as mentioned in the tutorial, and ensure you are using the latest version of Redsn0w. By preserving your baseband, you ensure that your Gevey SIM remains functional. If you update via standard iTunes restore, your baseband will be updated, and you will lose your unlock status permanently for that firmware version.
Follow these specific guides based on your operating system:
Windows: www.iclarified.com/20516/how-to-upgrade-your-iphone-to-ios-51-without-updating-your-baseband-win
Mac: www.iclarified.com/20512/how-to-upgrade-your-iphone-to-ios-51-without-updating-your-baseband-mac
Note: Use the iOS 5.1.1 firmware file instead of 5.1 as mentioned in the tutorial, and ensure you are using the latest version of Redsn0w. By preserving your baseband, you ensure that your Gevey SIM remains functional. If you update via standard iTunes restore, your baseband will be updated, and you will lose your unlock status permanently for that firmware version.