4k streaming with E-Box

Hi friends,

I got this E-box s912 some days ago. I’ll put here a link to this item on ebay, so you can see the specs: link removed

I am trying this item while having noticed that there are neither recensions nor feedbacks available on this. Nevertheless, I try to stream some 4k vids (got a 4k TV). The maximum available for youtube for example within YT-app is 1080p, in Youtube as Kodi-Addon 720p.

what do you thing, is this box able to stream 4k overall? Are there maybe some other 4k streams, with which I could test it further? Or could the 4k be fake for this box?
I am really wondering that obviously noone tested this box before.

Thank you in advance!