Just bought an iPhone 6 and transferred to a nano sim. I though I could just plug the new phone in and it would back up all my music but when I do plug it in, I get a message saying it can't be used and to download the latest iTunes. However the latest iTunes is already installed on the phone and as it won't connect to my Mac, I can't synch my music My Mac is OS X version 10.6.8. The other issue I have is that on my iPhone 4s, I wanted to return it to factory settings but forgot to turn off 'Find my Phone' and it won't allow me to restore . I've not been able to turn it off because it won't connect to the Apple server. Any ideas anyone?
[MOD EDIT: Subject heading changed to assist community]