Version: SCCM 2012 SP1 CU2 and MDT 2012 Update 1 (Upgrading to R2 and MDT 2013)
Part 1 – Upgrading to ADK 8.1
Download the latest ADK 8.1 (there was a re-release after Oct 17, 2013): http://www.microsoft.com/en-US/download/details.aspx?id=39982
First, the current ADK 8.0 needs to be uninstalled. Go to Programs and Features for removal.
Select ADK 8.0 and click Uninstall.
Run the adksetup.exe that was previously downloaded.
Accept the .NET Framework license and click the Accept & Install button.
Click yes when prompted by UAC.
Click Ok to notification prompt to reboot.
For location, you can change the install path.
In this example, the install path is changed to the E drive. Click Next.
For this install, selecting No to the CEIP.
Accept License Agreement.
For features, select Deployment Tools, Windows PE, and USMT. Click Install.
When complete, click Close.
Take note of the name and version in Program and Features. Version should begin with 8.1.
At this point, you can proceed with a reboot.