Emulate Windows 8.1 x64 on Android phones with Vectras VM

Extract everything, follow the instructions as shown in the video, paste the command below into QEMU PARAMS. Requires at least 3GB of free storage. Qemu params (tap the command to copy):

-M q35 -cpu core2duo,+avx -smp sockets=1,cores=4,threads=1 -m 756M -drive file=/storage/emulated/0/Documents/a.qcow2,aio=threads,if=virtio,cache=unsafe -vga std -device virtio-net-pci,netdev=n0 -netdev user,id=n0 -accel tcg,thread=multi,tb-size=2048 -device virtio-balloon-pci -device virtio-serial-pci -device virtio-rng-pci -device intel-iommu -bios /storage/emulated/0/Documents/OVMF.fd

Windows 8.1 is a release of the Windows NT operating system developed by Microsoft. It was released to manufacturing on August 27, 2013, and broadly released for retail sale on October 17, 2013, about a year after the retail release of its predecessor, and succeeded by Windows 10 on July 29, 2015. Windows 8.1 was made available for download via MSDN and Technet and available as a free upgrade for retail copies of Windows 8 and Windows RT users via the Windows Store. A server version, Windows Server 2012 R2, was released on October 18, 2013.