I dont want IOS11 I want my IOS 10 Back to my iphone 7

Most likely you will not be able to as Apple no longer provides a signed version of iOS 10.x.

Just do an Internet search for "How to downgrade from iOS 11" and you will find dozens of articles on this subject that you can choose from.

Sorry, downgrading is not supported by Apple. What troubleshooting steps have you taken to resolve whatever issues you're having?