I just got a used PowerEdge R710 with BIOS version 6.4.0 and confirming with my service tag I saw an update for version 6.6.0 so I created a bootable USB with freedos and copied the BIOS update exe. The installation from DOS went perfectly with no errors.

I rebooted the system and loaded F2 to change it back to UEFI. After saving changes and restarting I am stuck at this screen.

I am unable to load setup utility (F2) nor can I enter UEFI boot menu (F11). 

I tried powering off, draining flea power and holding CTRL+ ESC but the BIOS recovery never loaded. I have been using a wireless keyboard though.

Can anyone help me please? I am stressed out and worried that I've just bricked my first server.