Z 83 TV Box & Chuwi HiBox do NOT have a 3.0 USB?

[nogo]

Just tried on both boxes using the blue usb 3.0 plug with a harddisk, that shows ~85MB on a different PC:

On both boxes I get <37MB.

Windows is showing a remark, like "It would be better to plug a USB 3.0 device into a USB 3.0 plug"

I tried all three USB plugs, they all react and perform the same.

To confirm what I saw I've used the USB device tree viewer 3.1.2 from Uwe Sieber:

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Result: The accessable USB- plugs are connected to the inside HUB to the first three channels, all of them are high speed: 2.0. So no USB 3.0 connectable outside.

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To make it even more remarkable, the USB device tree viewer is showing, that the chipset has free USB 3.0 lines, but they seem not to be used/connected to something.

Can somebody examine one/both box(es) to confirm. Is the USB 3.0 advertised also for other z83x0 a fake? And am I the first one finding this incident or am I totally wrong?

BTW: I'm generally content with these boxes, anything else is, afaik, as advertised/expected.

[bluesmanuk]

I did a quick test on my Hibox with a USB 3.0 stick writing a single 1Gb file to the stick.

Average write speed on normal PC with USB 3.0 - 36MB/s
Average write speed on Hibox USB 3.0 - 36MB/s
Average write speed on Hibox USB 2.0 - 25MB/s

This indicates that the USB 3.0 port is as it should be.