Re: EliteDesk 800 G1 does not boot UEFI hard drives immediatly after BIOS->UEFI change

Since you are rebooting after the BCU command, i see no reason you could not do the following in your task sequence

* boot winpe in standard bios/legacy mode

* clean drive

* format drive as per requirements for windows 10

        https://msdn.microsoft.com/windows/hardware/commercialize/manufacture/desktop/configure-uefigpt-based-hard-drive-partitions?f=255&MSPPError=-2147217396

* make sure the larger partition has a label of OsDisk so the rest of the task sequence can apply the image to the right one

* run bcu to change bios settings for windows 10, uefi, secureboot, etc.

          enable 'fast boot'

          enable 'secureboot'

          enable 'uefi native mode'

          enable 'deep sleep'

* reboot