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Restored UEFI-based Windows 2008 R2 SP1 cannot be booted in Hyper-V environment

Restored UEFI-based Windows 2008 R2 SP1 cannot be booted in Hyper-V environment

KB ID:	2848
Product:	Veeam Agent for Microsoft Windows
Published:	2018-12-24
Last Modified:	2022-08-11

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Challenge

After successfully restoring a UEFI-based machine running Server 2008 R2 SP1 to a Hyper-V host, the VM fails to boot.

User-added image

Cause

The machine fails to boot due to a machine configuration that conflicts with Hyper-V.

For Hyper-V guest Virtual Machines, Server 2008 R2 is only support for use with Generation 1.
UEFI-based boot is only supported by the virtual machines using Generation 2.

Solution

As Hyper-V only supports Server 2008 R2 running in a Generation 1 VM, and Generation 1 in turn only supports MBR, the only solution to make the restored UEFI-based VM operational is to convert the bootloader from the incompatible UEFI (GPT) to MBR.

This process is documented in the Solution section of KB2407.

More Information

Windows guest operating system support

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