Please remember to Backup your phone before the UI6.1 update and considering one of the issues after installing One UI 6.1 is being unable to unlock the device, you may want to disable the lock screen before going ahead with the update.
You can change the screen lock type from the Settings » Security and privacy » Lock screen » Screen lock menu on your phone or tablet. Selecting the None screen lock type will disable the lock screen and make your phone boot straight to the home screen.
