Apple stops signing iOS 11.4.1, preventing downgrades from iOS 12 to iOS 11
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https://9to5mac.com/2018/10/08/downgrade-from-ios-12-to-ios-11-blocked/>
"With this change, users can no longer downgrade from iOS 12 to iOS 11."
Apple details five problems with iOS 12 that have been resolved
in iOS 12.0.1 released today, according to release notes.
Fixes an issue where iPhone XS devices did not charge when connected
Resolves iPhone XS devices rejoining Wi-Fi networks at 2.4 & not 5GHz
Restores the original position of the .?123 key on the iPad keyboard
Fixes an issue where subtitles don't appear in some video apps
Fixed some issues with Bluetooth becoming unavailable
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https://9to5mac.com/2018/10/08/ios-12-0-1-iphone-xs-charging-ipad-key-position/>