[3DBuff]

In regards to bandings, you need to be very careful on relying someone feedback about that, from my own experience and being a member of avsforum for 6 years, calibrating many projectors and learning the curve, I can tell you for sure 80% of users don't understand how to setup TV or a projector correctly regarding the colorspace. 
So I've tested Zidoo x9s with my SONY VML-VW760ES/VW885ES and there are no banding issues at all, so far the picture quality is absolutely the same as OPPO UDP-203 throws out, I didn't run specific tests yet like chroma sampling and other test patterns, but if you calibrate your unit correctly you shouldn't see the bandings. I'm pretty sure others people feedback about banding, was related to their PJ or TV settings not being able to provide good HDR along with BT2020 colorspace and HDR Gamma handling, that's why for instance you should use Tone Mapping as at the moment its best viewing experience than using native Gamma Handling of any Projector or a TV. Now there are many ways how you can achieve tone mapping, but I have Lumagen Pro 4444 and it does the job perfectly. Colours are superb, no bandings all details are present and its crispy as hell.      

 I reported my findings with banding in-depth on the Zidoo forum as well as in here previously. As I described in my banding tests here a while back, the test file I have been using:

The World In HDR 4K Demo.mkvhttp://4kmedia.org/the-world-in-hdr-uhd-4k-demo/

produced minimal banding when played directly though my TV using the TV's USB 3 input port. I use this file because it has serious banding issues and makes a great test file for banding. On the Zidoo, it suffers from severe banding in some modes, but some modes show minimal banding, exactly as my TV looks when playing it directly using its own media player. So it's not my TV - the Zidoo has banding issues in some modes.

Banding on the Zidoo:

HDMI mode: AUTO
Color Space: AUTO / YCbCr 444 / YCbCr 420
Deep Color Mode:
- OFF - severe banding
- 10bit - much less banding
- 12bit - minimal/no banding- AUTO - minimal/no banding

HDMI mode: Auto
Color Space: YCbCr 422 / RGB 444
Deep Color Mode:
- OFF - severe banding
- 10bit - severe banding
- 12bit - severe banding
- AUTO - severe banding

This also applies to the HDR 4k movies I have watched, including The Peanuts CGI film, which is also a good test for banding. As you can see, the modes that have the least banding is YCbCr 444 12bit / YCbCr 420 12bit. If it was my TV, then all modes would have severe banding, as well as playing back the content directly in my TV. As you can see, some modes show minimal/no banding, so my TV is certainly capable of displaying even problematic files with minimal banding, if sent the right signal.   

You cannot do reports like this.

1.  You haven't provided what display you've used.
2.  You haven't provided any screenshots of banding present
3. You should test those things via professional test patterns (HDR 10 Test Patterns ) https://diversifiedvideosolutions.com/dv...dr-10.html or at least AVS HD 709 test patterns known for all video calibrators)
4. You should test this on multiple displays to ensure its not the problem of your display and etc. 
When I have time I'll run several tests as I have all patterns required, will provide some screenshots as well.  

@sergejskr please post your results when you find some time.

Until then I really appreciate @lionne effort and input to this thread and general knowledge of the equipment. I have LG E6 series with all auto setting on Zidoo X9S. I can confirm Lionne finding. No banding in my case.