Plz help me VII hero stuck at rebooting POST code 78

[Applerogue]

Guys plz help me on this. My board is Maximus vii hero. I'm pretty sure I did everything right for flashback bios updating. After this I restart PC but it kept rebooting last POST code was 78. I've tried unplugged everything and CMOS and it didn't work. I'm not sure if it's just my board died or what...

[Raja]

Flash UEFI again with USB BIOS flashback. After that completes, use a single memory module only.