Is the MX 123 fully compatible with UHD and 4K, and 4K pass through? I have a MX121, and it seems some times it locks 4K from streaming content other times not, strange because it’s either going to handshake or not in my opinion. But, I guess depending on the streaming content it may have to do with if it has any UHD or other standard not compatible with the MX121. I plan on upgrading to the MX123 soon. Thanks.
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