Just an FYI. I ran the bios update for the primary bios on my 08G-P4-6276-KR GTX 1070 card and ran into a weird issue.
I ran the update, everything went fine. No errors. The command prompt disappeared. I wait a few minutes for everything to settle down and make sure that there wasn't anything else about to happen. Nothing did after about a minute.
As the instructions stated, I rebooted. Upon coming back up, everything was defaulted back to an abysmal resolution. PrecisionX stated that there was no hardware detected, and no Nvidia Control Panel. I attempted to run the BIOS update again and it hung for a while and dropped a few errors, which I neglected to get a screenshot thinking the primary BIOS had been pooched.
I shut my PC down and did a cold boot. Everything recovered fine at that point.
Not sure if this was the intended "restart" mentioned in the instructions, but if a cold boot is necessary, you might want to clarify that.
EDIT - clarification here as well, after the cold boot (and now warm boot), things have remained stable. The BIOS shown in the Nvidia Control Panel indicates the proper one.
2nd EDIT - Using a single GTX 1070 with dual displays (one via HDMI, one via DVI). When doing the update, and the "blank screen" mentioned, only my HDMI connected monitor came back. When I rebooted the first time after the update, my DVI was the only one connected and it was at a basic default resolution. After the cold boot, I got both monitors back. I keep thinking of details that might matter.
3rd EDIT - just went back a page or two and noticed one of the moderators mentioning disabling the driver before doing the update. If the driver causes issues with resolution and such when doing a BIOS update, it might be worth adding that into the instructions on HOW to disable that so n00bz like me don't freak out when stuff happens. :-P