Answer

Please enter BIOS setup menu to check the boot mode. BIOS setup menu -> Settings -> Advanced -> Windows OS Configuration -> Windows 8.1/10 WHQL Support = Disabled.

Models

H110M PRO-VH PLUS, Z170A GAMING M7, Z170A XPOWER GAMING TITANIUM EDITION, H270 PC MATE, Z270 GAMING M3, H110I PRO, H110M PRO-VDL D3, Z270 SLI PLUS, Z270I GAMING PRO CARBON AC, H110M GRENADE, H110M PRO-VHL, Z170A GAMING M3, Z270 GAMING M5, H110M PRO-VD PLUS , H270 GAMING PRO CARBON, Z270 GAMING PLUS, H110 PC MATE, H110M GAMING, H110M PRO-VDL, Z170A GAMING PRO CARBON, Z270 TOMAHAWK, H110M ECO, H110M PRO-VDP, Z270M MORTAR, H110M PRO-D, Z270 GAMING PRO, Z270 KRAIT GAMING, H170 GAMING M3, H110M-A PRO M2, H270I GAMING PRO AC, Z170A GAMING PRO, Z170A-G45 GAMING, Z270 CAMO SQUAD, Z270 GAMING M6 AC, H110M PRO-VH, Z170A KRAIT GAMING, Z170-A PRO, B150A GAMING PRO, H170A PC MATE, Z270-A PRO, Z270 SLI, H270 TOMAHAWK ARCTIC, B150 PC MATE, Z170A GAMING M5, Z170M MORTAR, Z270 GAMING M7, Z270 GAMING PRO CARBON, H110M PRO-VD, Z170A-S02, Z270 TOMAHAWK ARCTIC, Z170A PC MATE, Z170A SLI PLUS, H170A GAMING PRO, H270 GAMING M3, Z170A SLI, Z270 XPOWER GAMING TITANIUM, B150 GAMING M3, H110I PRO AC, Z170 KRAIT GAMING, B150M BAZOOKA PLUS, H270M MORTAR ARCTIC, Z270 TOMAHAWK OPT BOOST, H270M BAZOOKA, Z270 PC MATE, B150M MORTAR, H110M PRO-VD D3, Z270 MPOWER GAMING TITANIUM, Z170A GAMING M9 ACK, Z170I GAMING PRO AC