[noggin]

I will do it but ... I'm sorry, how can I attach colour bars and the screen grab of my TV? I need to photograph my TV with a smartphone. But what should I do to make the color bars appear on the TV? If you mean the screening grab of the monitor of my PC I can do it but it is another and  different thing.

PS: I need to choose "Standard format" on Sony HDMI. Right?

 You created a 2160p50 h.264 Rec 709 8-bit file for me with colour bars. Play that on the nVidia Shield TV in Kodi and take a photograph of the screen, or if you are concerned about playback quality in other formats create a colour bar file in that format (1080p50 etc.) 

Also take a picture of it displaying 'real' content ?

As we have discussed offline - Standard vs Enhanced is about whether you output 'Standard' HDMI 1.4 bandwidth 2160p50 content (i.e. 420 8-bit 2160p50) or whether you output 'Enhanced' HDMI 2.0 high-bandwidth 2160p50 content (i.e. 422 12-bit 2160p50 or 444/RGB 8-bit 2160p50)  (Although 420 8-bit 2160p50/60 HDMI output is part of the HDMI 2.0 spec, it is the only 2160p50/60 format that is within HDMI 1.4 bandwidth, and was added so that early HDTVs could handle 2160p50 content with HDMI 1.4 hardware. It's fine for 8-bit SDR - like most UHD DVB-S2 stuff (aka Sky Q in the UK) but isn't suitable for HDR at 2160p50/60)

In our offline discussions you have reported you have problems with Enhanced mode on your Shield TV and Sony TV combination, so you are using Standard right? (This could be a TV compatibility issue or a cable issue).  I do not have those problems so I use Enhanced (my AVR also runs in Enhanced).