Server wont start after upgrade to 91112

Server wont start after upgrade to 91112

I performed an update to 91112 and then it was for every 'Starting' a few reboot didn't resolve. uninstalled, reinstalled old version 90170 and restored backup. now doesn't start as 'Previous Patch not applied properly' shouldn't the Backup not had this flag set before it performed a Backup?
Thanks
Paul

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