Hello I would suggest researching upgrade procedures on VMware's site. I'm not aware of any firmware or BIOS requirements for the upgrade. You should use our custom image to perform the upgrade. Our custom image contains necessary VIBs for the hardware to function. If you use a standard VMware image to perform the upgrade then it is possible the operating system may not load correctly due to missing drivers/VIBs. You can find our custom image on the download page for the R520 at dell.com/support. Change the operating system at the top to VMware 6 and it will be listed under the Enterprise Solutions category. Thanks
Running VSphere 5.5 now trying to plan the upgrade to vSphere 6 U2.  Searching for any specific requirements or update necessities prior to performing the upgrade.  Appreciate any experience or insight your willing to share.Thanks Chris
Does the R520 Need specific Drivers/firmware for an Upgrade ESXi 6 U2?