Z220 workstation with E3-1225 v2 processor. Upgrade to BIOS K51-V01.84 causes boot failure when Option ROM Launch Policy is "UEFI Only" with or without Secure Boot enabled. I boot with the POST delay set to 10 seconds. With the 1.84 BIOS the boot process does not proceed to announcing the POST delay. ME firmware upgraded last month to 8.1.71.3608.
I have no issues with and reverted back to the 1.83 BIOS with Secure Boot enabled.
My other Z220 workstation with E3-1245 v2 processor has no issues with the 1.84 BIOS.