UCS C220 M6S VMWARE 8.0.1 legacy boot detected

[AdamG73545]

After upgrading 7.0.1 to 8.0.1 I see this message: BIOS_FIRMWARE_TYPE_WARNING: legacy boot detected ..... 

Not sure if I can ignore it or if should I change BOOT to UEFI? 

[Steven Tardy]

Changing from Legacy BIOS to UEFI (while it may function) isn't supported by VMware (according to a prior VMware support case).

So if you do change from Legacy BIOS to UEFI, then I would suggest reinstalling ESXi (make sure you have your keys/licenses saved first).