I am currently using an iPhone 3GS. My phone's iOS version is 4.1. I want to upgrade to 4.3 but the latest version is 6.0. How can I upgrade to 4.3 or 4.5 from 4.1?
IOS – upgrade the iPhone’s iOS from 4.1 to 4.3
iosiphone
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Best Answer
Simple answer is no it will not work.
Apple stopped signing old versions long ago; you either have to stay on the iOS you have or update to the latest your device will support.
A 3GS will support iOS 6.1.6 available via iTunes or direct from http://ipswdownloader.com