Purchased Used Poweredge R710 - Came with custom firmware.. how can I reflash it back to 6.4.0

Service Tag: HNV0DQ1 | Express Service Code: 38448107641

I would like to flash the bios on this to get it back to factory settings.

I tried the R710-060400C bios executable, I get back this error:

Cannot use a Dell Systems PowerEdge R710" Bios in a "Arcsight, Inc - 7200 Series"
Press any key to exit..

And it dumps me back to my bootable usb.

Arcsight is now HP, and they haven't been very helpful.

How can I force this bios firmware to bring it back to stock.

Thanks

R

EDIT:

I found it - had to flash the bios with the /forcetype flag.

this can be closed.