Intel NUC When I hit f7 nothing happens

Hi there,

I'm trying to update the BIOS but when I hit f7 nothing happens. It has vmware esxi on it so I cannot update the BIOS from windows. It has version 17 on it and I'm trying to update it to the latest version which is 30.

I bought 2 NUC's for my vmware lab. I bought two DC53427HYE. I was able to update the BIOS on one of the NUC's but not this other one because again when I hit f7 to update it nothing happens.

Please advise.