My BIOS version is:
Core Versión: 5.011
Compliancy: UEFI 2.4; PI 1.3
Build Date and Time: 03/07/2016 16:09:36
And in Advandec Tab I can see two options, one called Android with many sub options and other called System Component with an option called OS Image ID with two sub options Windows 8.1 and Android
My Tablet is not DualBoot, is only Windows buyed in GearBest on March 23th.