X64 Exception Type 02-NMI Detected after bios firmware update

Hi

We have recently moved to DL380 Gen9 servers from Gen8's. We use them in a manufaturing enviroment

with our own propriotary PCI-e cards. The cards functioned fine until we installed

  BIOS firmware P89 V1.5 (07/20/2015)  in “HP Service Pack for ProLiant 2015.10.0(v10.0_1)”

We are now experiencing the following error during POST.

 -   HP ProLiant DL380 Gen9 servers may hang at approx 83% during POST.

-  "X64 Exception Type 02 – NMI Detected" error displayed on (Post)

 Note: The above issues may occur in either UEFI or Legacy boot modes.

Does anyone have any input on where I should begin in finding the cause/solution??

Thanks for any help on where to begin ( and no, picking a new card is not a option.)