Some weeks ago, the ESXi host I was running some VMs on crashed (power faillure) and after powering back up and starting the VMs on this standalone host, one of the VMs didn't boot up properly.
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This VM runs Windows Server 2012 and booted up this time into the EFI environment.
After some investigation, the EFI configuration is gone. When opening up the Boot Maintenance Manager and choose 'Configure boot options', no options are listed. When adding a new boot option and using the save function, the settings are lost instantly. When comparing the settings with other 2012 VMs I have running, I am missing alot of configuration like the boot options, and some driver options.
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Both options will not save after exiting the menu for adding those options. When choosing 'Boot from a file' I can startup the VM using the 'NO VOLUME LABELEFIBootbootx64.efi' file. After rebooting the VM, it will be back at the EFI environment.
It's very hard to find information about the EFI BIOS so I hope someone here has some experience with it.
I even tried restoring the VM files of about 2 weeks ago before the crash, but even with those files the VM will boot into EFI environment with no settings at all. So maybe the problem was caused earlier; very weird! Also not being able to save new settings to the EFI environment seems very strange to me.