There are (hypothetically) two ways:
in the bios: caps lock + num lock + scroll lock + alt-f
you have to be on the kvm for this to work, or at least I assume, because it didn’t work over idrac for me
jumper shuffle
shut down the blade, pull it out of the chassis, open it up, find the nvram_clr jumper (see picture), toggle it, put it all back together, boot up, watch for the “restoring factory defaults” message (or something like that, I didn’t get to see it, colo hands-and-eyes guy did), power the blade down again, pull it out, open it up, flip the jumper back, put it together again, re-rack, power up and hit F1… done.
