Can I downgrade an iPhone 4S using a Gevey SIM on iOS 6.1.3?
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nsakpheak • July 27, 2013 at 6:02am
I would like to know if it is possible to downgrade an iPhone 4S that is currently running iOS 6.1.3 and using a Gevey SIM for cellular connectivity.
Answers
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iClarified • January 14, 2026 at 3:17am
Downgrading an iPhone 4S from iOS 6.1.3 is generally not possible unless you have saved SHSH blobs for the specific firmware version you want to move to. Apple stopped signing older versions of iOS for the iPhone 4S many years ago, which normally prevents downgrades. If you are looking to jailbreak, a better approach is to use a jailbreak tool compatible with iOS 6.1.3. Be aware that changing firmware can affect your Gevey SIM's ability to unlock the device, as these interposers are often tied to specific baseband versions.