You can determine how your computer searches for non-volatile data storage devices to load an operating system by changing the boot order in the BIOS with the 1E BIOS to UEFI Boot Order task sequence step.

To change boot order in the task sequence:

1. From the Properties menu, choose 1E BIOS to UEFI Boot Order.
2. In UEFI Boot Order, select from:
   
   
   • Windows Boot Manager – sets the Windows Boot Manager to be the only device in UEFI boot list. The Windows Boot Manager appears in the boot list only if a previous OS was installed in UEFI mode. If this entry is not found at when the boot order step in the task sequence runs, the primary hard drive is used. Other UEFI devices such as optical drives, network adapters are disabled when you choose Windows Boot Manager. On machines where you cannot disable a UEFI device, Windows Boot Manager is prioritised at the top of the list and UEFI devices that cannot be disabled are ordered at the bottom of the list.
   • Windows Boot Manager, UEFI PXE – the boot order is Windows Boot Manager, followed by UEFI PXE. All other UEFI devices such as optical drives are disabled. On machines where you cannot disable UEFI devices, they are ordered at the bottom of the list.
   • UEFI PXE – IPv4 and IPv6 devices are supported but precedence is given to IPv4.

1E BIOS to UEFI Boot order in a task sequence

The boot order can be added to various stages of a task sequence. For example:

1. After installing the OS, so that other UEFI devices such as drives and network adapters are not used on the next reboot. 
   
2. It can be used if the primary hard disk is to be sequence first in the UEFI boot order in WinPE – the Windows Boot Manager appears in the boot list only if a previous OS was installed in UEFI mode. If this entry is not found at when the boot order step in the task sequence runs, the primary hard drive is used.
   
   This is useful in HP and Lenovo devices where network adapters may enabled by default in the UEFI boot list which sets them as the first bootable device. Setting boot order to primary hard disk ensures that the device restarts to WinPE and the task sequence continues.
3. It can be used to set network adapters to be sequenced first in UEFI boot list and disable other hard disks (some makes and models cannot disable hard disks). This may be useful when task sequence is to be executed from PXE boot on a restart.