Which iOS version is the best upgrade for an iPhone 3GS on iOS 4.0.1?
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hellomahesh • February 9, 2013 at 1:15pm
I am looking for the best iOS upgrade path for an iPhone 3GS currently running iOS 4.0.1. The device is currently jailbroken and unlocked, and I would like to retain all my data and apps during the process while following specific instructions.
Answers
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iClarified • January 12, 2026 at 7:45am
The final and most stable version of iOS for the iPhone 3GS is iOS 6.1.6. To upgrade from iOS 4.0.1 while preserving your unlock and jailbreak, you must avoid a standard iTunes update which will update your baseband. Instead, you should use a tool like Redsn0w or PwnageTool to create a custom firmware file. This allows you to update the operating system without changing the modem firmware, which is necessary to keep the device unlocked. Before beginning, make sure to perform a full backup of your device in iTunes to ensure your data and applications are saved. Once your custom firmware is ready, you can perform a Restore in iTunes by holding the Shift key (or Option on Mac) and selecting the custom file. You can find detailed step-by-step guides for this process in the iClarified tutorials section.