Before you start, sorry if I'm wrong section and if I make mistakes, I am French ^^' Hello ! I just purchased a iPhone 6 64GB iOS 8.4, so I would like to transfer my backup my old laptop, a iPhone 4S 16GB iOS 7.1.1 JB Pangu, via iTunes. And this is where I have two problems, the first is that the iPhone 4S iOS 7.1.1 and iPhone 6 is iOS 8.4, is there going to be a problem in transfer backup as they are not the same version? The second is that my iPhone 4S is JB, so if I transfer my backup to this iPhone 4S toward 6 via iTunes, and will this be a problem? Is it necessary to remove the JB in my 4S before my backup or JB is not reflected in the backup? Knowing that I do not want to "Restore" my phone because I do not want to lose all my backup. There, there. Thank you in advance for your answers!