As of today, there will be no downgrading on older iOS 11. iOS 11.2.5 is the only firmware being signed now. Did you missed your chance to downgrade?
Update: iOS 11.2.2 is being re-signed only for X
Updated: https://forums.macrumors.com/threads/apple-stops-signing-older-versions-of-ios-11.2103917/
Update: iOS 11.2.2 is being re-signed only for X
Updated: https://forums.macrumors.com/threads/apple-stops-signing-older-versions-of-ios-11.2103917/
Last edited: