I bought a surface 3 (4GB/128GB) around Christmas time. The unit came preinstalled with Windows 10. I have ran all windows updates but I just don't like the operating system as much as I do windows 8.1. I have 8.1 installed on my SP3 which I love. I almost exclusive use it in tablet mode. Is it possible to downgrade to 8.1 on my S3 even though it came with 10 preinstalled?