Sccm 2016 fep not updating
If you’re running a multi-tier hierarchy, start at the top-level site in the hierarchy.After the top-level site upgrades, you can begin the upgrade of each child site.SCCM 1511 is still the baseline version if you’re starting from scratch.
“When you deploy a new operating system, computers that run the task sequence can use Windows PE Peer Cache (a new capability in Configuration Manager) to obtain content from a local peer (a peer cache source) instead of downloading content from a distribution point.
When the installer runs the Prerequisites Check, it is interesting that the Technical Preview 2 is still referencing/leveraging the Windows Assessment and Deployment Kit (ADK) for Windows 8.1, and not Windows 10 (even if it is only still in preview).
In addition to the features contained within the “R2 SP1” release (see my article here: First Look At System Center Configuration Manager 2012 R2 Service Pack 1), there are some additional features now included.
You can use this new media to install a new site, or upgrade from System Center 2012 Configuration Manager with Service Pack 2 or System Center 2012 R2 Configuration Manager with Service Pack 1.
See the Technet documentation for more information about the new media.*If you are running SCCM 1511 or 1602, the latest updates will be replaced by SCCM 1606 in the SCCM Console after installation.