As you might already read on my Twitter... Appearently HMD doesn't want us to unlock their newest phone root it.
So the whole procedure is a bit painful but I eventually made it.
Appearently, I do not encourage you to root your device or you'll lose warranty, but I'm a hardcore developer and Nokia enthusiast, why not?
Mine is a TA-1131 (Chinese Nokia X7).
No, this is not a guide, and I will not tell you how to root it



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But the DRM key will be lost (Only X7 / 8.1). Losing DRM key means: You can't enjoy DRM protected HD videos like Netflix HD. I don't watch Netflix at all, so I don't mind.
I'm investigating how to recover DRM key.