It won't work because Apple is not signing anything other than the latest version of iOS 9 for the iPhone 4s and iPad 2. Part of the update procedure is an online verification with Apple servers. If you're attempting to install an unsigned iOS version, the verification will fail every time. Jailbreaking will not allow you to install an unsigned version of iOS.@scifan57
What he's trying to say is he cannot go straight to the latest version from 4.3.3. - this is the reason he is trying to get to IOS 5 first:
You cannot jump to IOS 9.1 from version 4.3.3 (some sort of coding issue), you can only jump to IOS 9.1 from IOS 5 or greater, so if you're anything below that it is unfortunately nearly impossible (you will continue to receive error 9). You must first get to IOS 5 which he is trying to do, but because it isn't signed there is no way.
This might be a method that may work for you:
There was recently a find that strictly iPhone 4S & iPad 2 can get to IOS 6.1.3.
See if you have any luck with this method, so instead of going 4.3.3 -> 5 -> 9.1, you could go 4.3.3 -> 6.1.3 -> 9.1
This method does require to be jailbroken though, so you will have to jailbreak your 4.3.3 then eventually you will get to standard 9.1.
Hope this helps.
The narrator in the video says it only works with signed iOS versions.
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