This video talk about iOS 11 review.
And also will teach you how to downgrade to iOS 10.
ipsw download URL:
slideshare URL:
https://www.slideshare.net/ming40324/ios-11review-downgrade-to-ios-10
slideshare URL:
https://www.slideshare.net/ming40324/ios-11review-downgrade-to-ios-10