Bios Update Clears CMOS

[Maximusfoximus]

I have an ASUS Maximus Hero X wifi/ac motherboard, and every time I update the bios it clears all my overclock settings, fan profiles, and aura settings. Is this normal for a bios update? or is there something wrong with my board?

[Husky]

That is normal, it does the same for me with my ASUS Z170-DELUXE.

 

It is required and recommended to also clear CMOS just before the update as well. The CMOS is cleared because the configuration settings stored in the CMOS might be incompatible with the new version of the UEFI BIOS, and to prevent instability during the update.

[PineyCreek]

Not to mention that all the manuals say you should be clearing your CMOS on BIOS updates anyway.  Really, it's a common recommendation from most board OEMs these days because it heads off things like "I updated my BIOS while running custom settings and post-update my system isn't stable" because something in the microcode was tweaked or a setting added/removed and you need to take that into account on a configuration.