How to remove ‘We couldn’t undo the changes – Contact Support’ scam
You may see the message ‘We couldn’t undo the changes – Contact Support’ with logging into the system. At first, a user may mistake the lock screen for a genuine Windows update process and decide to wait until the end. Anyway, there is no other option, and after some time of waiting you will get the message about inability to complete the updates. As a possible solution there is a phone number of technical support.