iPhone 5S will not let me restore to a back up before iOS 8.4
I really, really dislike the new music app so I want to restore my iPhone to the way it was before I updated to iOS 8.4. I have a back up from April which would work fine, but once I restore before I can do anything my iPhone is requiring me to update to 8.4. I get a white screen with the words slide to upgrade. I DO NOT WANT TO UPGRADE.
Any suggestion how to bypass this irritating upgrade and go back to 8.3 or whatever I had before.
iPhone 5s, iOS 8.1.3