Hey guys, I was wondering if anyone can advise what to do? Here is a MS Surface Pro 3 laptop with Windows 10 from the factory. I want to install Windows 8.1, what is the best way to do this? Will the factory Windows 10 license allow to install Windows 8.1 media from download thread? Is there BIOS mod for Surface Pro 3 that allows Windows 8.1 activation? I hope KMS solution is not necessary? Please any experience would be appreciated.