Advice before updating: remove your password and fingerprint. This help you to get back into your phone

[confluence]

Before you update the new UI 7...

You must first remove your password and fingerprint. This help you to get back to your phone right after the update. Why you can't log back in after update is because of the Samsung SwiftKey. I advice you set your device to swipe...right after the update then you set back your securities...

[iamthecosmicdust]

Always back up your important data before any update, just in case something unexpected happens during the process. 

Thanks again for sharing your advice! This could save a lot of frustration for users updating their devices.