Will upgrading iPhone 3GS from 4.3.5 -> 5.0 work? [closed]

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I'm looking at upgrading my development iPhone 3GS from iOS4.3.5 to iOS5. Now that Apple even rejects apps that use the older SDK and contain an iPhone 5 launch image, I see no need to keep my iPhone 3GS on iOS4.

Even though the latest s/w for iPhone 3GS is iOS6, will an upgrade to iOS5 be successful through the server verification. I ask because I tried to restore in a similar situation previously on a different device (and different iOS versions) but it wouldn't let me so I had to upgrade to the latest compatible version of iOS.

Success/failure stories would be much appreciated.

Thanks, James

PS. this may not be a techy question, but as a community of developers, this seems to be the best place to ask!

Answer 1

Apple no longer signs iOS5 meaning that you can't restore to iOS5 unless you have previously saved the SHSH blobs either in Cydia or with a tool such as TinyUmbrella.

See Explained: SHSH Blobs