That’s simple. Just download the windows 10 ISO on their website, make a usb tool and install on your device. If its already on windows 10 before then it will automatically activated.
That’s the problem, they don’t have files on their site. They didn’t provide any. So I’m looking for a compatible device. I tried downloading a windows 10 bootable on USB. I used it on my other laptop and its working. But with my tablet it can’t boot