They may have removed them now @Lumberjack - last board I've used them on is Z170. If you insert a new Qflash module it will update the backup, but since that is brand new board and latest BIOS I'm sure it already has latest. Only option left is programming.
You can try the DOS Flash tool included with the BIOS downloads, and add these switches to end of command testing each one at a time, you will see it flash second BIOS after first, if it happens >> /X or /Y or /Z

Making backup match main is good for two reasons, one you know that version is compatible with your CPU, and two it's better for stability that way.

@Falkentyne - That's how to do it when they're nice enough to give you physical control!
Asus rarely gives switches, sometimes uses dual BIOS but mainly only on non-mainstream boards, and they haven't even being doing that much in past 3-5 years either, and are now starting to use soldered BIOS instead of socketed too which they used to always use.

Zitat von Lumberjack im Beitrag #30

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@Lost_N_BIOS & @Falkentyne - I tried the hotkey trick several times before the bios screen (CTRL + F10) to no avail. I contacted Gigabyte once again and they have informed me that they have officially removed these bios flash hotkey commands after their Z170 motherboard line.

He also told me that if the board doesn't have a physical bios switch, there is no way to induce a backup bios flash. Some dualbios boards without a bios switch do feature an automatic backup bios update, however, it depends on whether or not the developers deem it necessary for a particular board to update the backup bios every time the main bios is successfully updated. And I agree: It's a damn shame that a board in this price league - it's definitely among the more expensive Z390 boards - doesn't at least have a bios switch or socketed insertions.

Is there any other way left, besides the programmer, to update the backup bios to the main bios version? Now that I know that the main bios is working correctly and I won't play around with the bios settings, will there even be a need for a backup bios? Is it possible that the main bios corrupts out of the blue?

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@Lost_N_BIOS - I can't believe it.... after the PC has been performing normally over the last few days, all under the newest Firmware F6a, it's again stuck in a reboot loop. Like a curse..... what can put the motherboard into a reboot loop a few days AFTER a successful bios update to the newest firmware? It happened out of the blue... I was restarting the pc a couple of times because I wanted to fine-tune the hackintosh clover boot options and settings, and all of a sudden, and after the fourth time or so, it got stuck in a reboot loop.

Surely it can't be a corrupted main bios once again? Are maybe some cables behind the motherboard causing short circuits etc.?

@Lumberjack - maybe you have some instability issue, are you running stock speeds? What is your memory speed and how do you have it setup (XMP or manual etc)? Have you ran extended Memtest on this as it's setup now?
Were you forcefully rebooting, shutting down by force mid startup etc? That can cause it if done in certain ways

@Lost_N_BIOS - No, I was just rebooting for the fourth time. I haven't touched any physical buttons, just reboot from Mac OS X. My PSU is still under warranty, so I'll send it in and see if it's maybe the PSU that's at fault here. Other than that, I don't have any options left. The motherboard is new, the RAM is new, CPU is new, GPU is a bit older but I already tried it without GPU and it leads to the same reboot loop. Only component left is the PSU.

I doubt it's PSU, but maybe could be if it's badly unstable. More likely memory or CPU instability, new means nothing here, nor does using auto settings.
This is especially true for memory and in regards to memory sometimes XMP or auto can be worse than setting things yourself to stock values, especially if the memory is not made for this chipset.

@Lost_N_Bios - So far it seems to be the PSU's fault. I got a new one today, installed it, and now the system functions as it's suppossed to. Maybe it's because the motherboard was disconnected for several days. At this point nothing would surprise me. I bought a PSU tester specifically to rule out a PSU failure, but I guess delivering good voltages into a handsized PSU teste ris no guarantee that it will perform as good under realistic load...

Give it a few weeks before you are sure, remember this time, and before, you used system for a while before anything happened. Disconnected for a few days shouldn't cause that, but if CMOS battery socket is loose, or battery is not good, you might loose settings or time
I agree, PSU tester only gives a good indication if it's reasonably OK, but is in no way a proper way to know 100% for sure if all rails are stable or if there are major spikes or drops that would cause issues that you might only see for milliseconds with an oscilloscope.