Complete the upgrade of each site before you begin to upgrade the next site.
At console opening, if you are not running the latest version, you will receive a warning and the update will start automatically.
Before applying this update, we strongly recommend that you go through the upgrade check list provided on Technet.
Most importantly, initiate a site backup before your upgrade.
Resolution: Drivers from a previous deployment, using the UIU, remain in the Driver Store and interfere with the driver refresh operation.
UIUPrep now clears out previously staged UIU Drivers prior to applying the newly refreshed drivers.
If you’re running a multi-tier hierarchy, start at the top-level site in the hierarchy.