XG1v4-A

I have an XG1v4-A cable box. Does its HDMI port support 4K/120Hz/ HDMI 2.1 ?

Yes, it may play fine, but does it specifically support the spec I've listed? Can you share a spec sheet for the HDMI connection?

Is there a newer cable box with DVR you offer that is higher spec than my XG1v4-A?