W
You would be far better off asking your question in the 8X forum instead of ask a question
HTC 8X - Windows Central Forums
Preview for developers, yes. Xandaros is right, thats the way to go. I have my HTC 8X on 8.1 on Developers Preview. Simple and painless process mostly. Except for signing up for the developers accounts. That takes an extra five.
Although my HTC is on its last legs because of the batteries giving out on me, but then it is so many years old now. But it has stood up well to the tests of time, no back fading, and aged very gracefully well. Beside the battery. Would love it if I could install a spare battery myself on it.
-- W