Try these 8 possible solutions first before you take your iPhone X apart or bring it into a repair shop.
If you are experiencing issues with your camera (front or back camera) such as blurry, out of focus, error, is black or some other problems make sure to try every step and if still no go try every step again 5 or 6 more times. Let me know which method or combo of method works for you.

Most of you will have a working camera after following the steps in this video.

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Also i am not responsible for anything going wrong so DO AT YOUR OWN RISK!