HTC has delayed the Oreo update for HTC U11 in Europe and apologized for their delay a week before. Now the update has started to rollout for devices in Europe, the Middle East and Africa region.
The Update weighs around 1.31GB in size and carries the version number 2.22.401.10. The update brings the system stability along with Android Oreo update, which also brings performance in the Edge launcher and more detailed notifications.
To check the update manually head to settings-> About-> software update. It will take couple of days for the update to hit all devices as they will be rolled out in phases.