Vmware fusion 11 choose firmware type9/20/2023 OK, UEFI sounds great, but what if you have Window VMs that had been configured with BIOS firmware? Is it as simple as just reconfiguring the virtual hardware? Well, prior to Windows 10/Server 2016, the answer was no and you had to re-install the Windows OS as you could not simply update the Firmware while preserving the OS. Note: The ESXi Hypervisor also supports Secure Boot for itself, for more details check out this blog post here. To be able to leverage these capabilities, UEFI firmware is also required. ![]() In addition to Secure Boot, both Windows 10 and Server 2016 also supports a new security capability from Microsoft called Virtualization-based Security (VBS) which in-turn is used by other features such as Credential Guard for example. Support for Secure Boot was first introduced in vSphere 6.5 and here is a blog post that gets into more details. If you want to enable Secure Boot for Windows or any other OS that supports Secure Boot, UEFI firmware is a requirement. UPDATE (01/07/21) - As of vSphere 6.7 Update 3, the default firmware for creating a Windows 10 and Windows Server 2016 guest OS is now EFI This is especially important since the default firmware type in vSphere for these OSes are BIOS. Interestingly, for Microsoft Windows 10 and Windows Server 2016, there are some important implications to be aware of on whether BIOS or UEFI is used. ![]() Like most customers, I do not even bother touching this setting and I just assume the system defaults are sufficient. When creating a Virtual Machine in either vSphere or Fusion/Workstation, customers have the option to override the default and specify the specific Firmware boot option whether that is BIOS or UEFI. Several weeks back I was chatting with a few of our Engineers from the Core Platform Team (vSphere) and they had shared an interesting tidbit which I thought I was worth mentioning to my readers.
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