Q: setup i phone 6 with old phone backup
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Aug 7, 2015 7:37 AMby Nubz N.,Hello siwroe,
It sounds like you have a new iPhone 6 with iOS 8.3 on it and you want to do an initial setup by restoring from an iPhone 5, iOS 8.4 backup.
To do that, you will want to upgrade the iPhone 6 to iOS 8.4 first as described in this article.
Transfer content from an iPhone, iPad, or iPod touch to a new device - Apple Support
You can't install a backup of a newer version of iOS onto devices that are using earlier versions of iOS. If your backup came from a device that has a newer version of iOS installed, update your new device before you transfer your data. For help, see Unable to restore from a backup of a newer iOS device.
Please read through that article for the details.
Enjoy your new iPhone.
