Converting BIOS to UEFI on Think Products with ConfigMgr
A new Task Sequence Variable, TSUEFIDrive, was introduced in Configuration Manager Current Branch version 1610. This variable will prepare the hard drive for transition to UEFI from legacy BIOS, in one task sequence. This is extremely helpful if you're migrating systems from Windows 7 to Windows 10 in a refresh scenario.
A detailed walk-through by the Microsoft team on how to configure your Task Sequence for use with this variable can be found here. We want to focus on step 5 from this guide: