I have just had a V6 box installed and I am very happy but I notice that the box isn't allowing me to select 2160p display. My TV is very new (LG55UH850V) so is this a problem with the TV or the V6 box?
Is the HDMI cable going from the v6 box straight to the to tv?
i had mine going through a Yamaha amp that has 4K up scaling and 4K throughput and it will not work as the amp is not hdcp 2.2 so I can only choose 1080p but if I go straight to the to tv f I'm the v6 box I can then pick 2160p.
so check to see if your TVs is hdcp 2.2 and if it is check which HDMI port supports this , please don't assume all 4K TVs are the same
I had the same problem I had to go in to my tv settings and there is a option called hdmi 2.0 format which lets me use standard format and enhanced in enhanced the v6 won't show in 4k in standard it will
i guess the best thing to do is try all of the hdmi connections until one lets you use 2160p (4k) I had a quick google search but could not find much info on which hdmi ports if any are hdcp 2.2, but I pretty much can be certain if the tv is not hdcp 2.2 that's why it wont work, but having said that if its a very recent tv it should be hdcp 2.2 but it may be only one of the inputs.
I am guessing that the V6 needs some firmware updates around the HDMI sync as it doesn't recognise your TV as a 4K display. My V6 wouldn't work consistantly at 1080p. If you select all video modes under settings on the V6, does that help? It might then default HD broadcast to 720p but try an online service like YouTube and that should display at 1080p. Is there an online service that offers 4K? If so, try that. My V6 seems to override the TV upscaling and display at a lower res, which is fine I suppose, but a backward step from the old box which allowed the TV to upscale.
Also, have you run the resolution test? It proves if the V6 will put out a signal, but it doesn't mean that it will allow all thangs to display at that res.