A lot of people ask about these, so I thought I'd post here so I can point to this in future. Might not be suitable for everyone, but these are the settings I recommend from 2K & 4K viewing on the new Zidoo models: MAIN SETTINGS Playback/Automatic frame rate/Frame rate mode: Switch frame rate and resolution Display/HDR: Auto * Display/Color Settings/4K 50~60Hz: Priority YUV420 10BIT Display/Color Settings/4K 23~30Hz: Priority YUV444 10BIT Display/Color Settings/Non-4K: Priority YUV444 8BIT Display/Color Settings/HDMI Range: 16-235 ** Display/HDMI Mode: 3840x2160p 23Hz *** Audio/HDMI Audio: RAW Audio/Downmix HD Audio output: OFF * Can be set discretely - available options are EDID dependent see below. ** This sets 64 - 940 for 10-bit content. Can be set for Auto but I prefer to set discretely *** This is personal preference and assuming auto framerate/resolution is on, it is only the gui setting. (Set this last since changing HDR mode resets HDMI Mode) OTHER SETTINGS Display/MaxCLL and MaxFALL: ON **** Display/Colour Settings/Deep Colour Compatibility Mode: OFF ***** **** Some systems use MaxFALL/CCL, some don't. Generally leaving ON is fine because even if the system ignores it, there's no issue with the SEI message containing it. Can be useful to turn off for outboard gamma processing. ***** Enables forcing of 4K50/60 4:2:0 10/12-bit even if EDID does not allow. (Some TVs can accept this signal even though EDID says it can't) If your EDID does specify 4K50/60 4:2:0 10/12-bit this setting will have no effect. If your EDID does not specify 4K50/60 4:2:0 10/12-bit and does not allow it, setting ON will cause picture loss. HDR SETTINGS FROM v6.0.50 Available settings will depend on EDID DOLBY VISION COMPATIBILITY MODE (v6.0.90 onwards) Display/Dolby vision compatible mode/<on><off> This allows displays that can process both Standard DV and LLDV to prioritise which mode is used with DV output. <ON> - Standard DV is prioritised <OFF> - LLDV is prioritised DOLBY VISION MKV COMPATIBILITY The table below shows the expected outputs for different Dolby Vision Profiles of the VS10 engine. Output of DV or LLDV is EDID dependent and all tests were made with Level 6 files (4K23) LEGAL HDMI MODES For information, below is a table detailing legal HDMI modes at 4K for both HDMI 1.4 and 2.* The numbers show the bitrate, ie. bandwidth required, for each mode. Where it shows "--", it is not legal mode and therefore not supported by HDMI. HDFURY VERTEX SETTINGS FOR LLDV For those with a Vertex or similar and an HDR TV who wish to try the LLDV trick, Attached is a quick and dirty PDF to show how to set this up. This fools the Zidoo into thinking it's connected to a TV capable of LLDV but remaps the colour primaries into BT.2020 allowing it to be viewed correctly with standard HDR settings.