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Regarding the error you are getting, you need to make sure your HDMI cable is HDMI 2.0 / 2.1.
Older HDMI cables, like HDMI 1.4, could do some 4k but it's not made to support the full bandwidth of 4k.
For further verifications, you can join our technical support team through the following link: http://bit.ly/FB_Contact_Us
Have good day!