HTC has released a new firmware update software update 1.13.401.1 for HTC U11 is now available. The update comes with Android security update. The update is now rolling out in the Middle East and Africa.
The update also includes regular bug fixes and system improvements. As the update is now rolled out over the air with the download size around 333MB. It may take a while to reach your new device.
You can also manually check for the OTA update, just head over to Settings > About device > System updates. But before hitting the download button, ensure that your handset is sufficiently charged and connected to a WiFi network.