True what people are saying about no ability to roll back, but if you want to install windows 10 to the device, you used to be able to buy 1 time activation keys for stupid cheap (under $10). Then you just have to flash a USB with the windows 10 installer ISO and use the key when you get to that point.

The downside of a one time activation is that if you ever brick the OS or some such, you have to buy another key and can't reuse the original you purchased.