Bug in GL-AR750S-Ext (Slate) makes it non compliant with international regulations?

Hello,

the Slate comes out of the box configured for use in the US and I could not find an effective way to change the country of operation, thus making it non compliant with international regulations about WiFi frequencies use.
Has anyone done this successfully?

What I tried:
since there is no direct way to change the country of operation from the default web gui, I installed LuCI and found a way to set it to IT (Italy) from there.
I have seen that the setting gets written to /etc/config/wireless and apparently applied to the driver but when I issue a “iw reg get” I see this:

root@GL-AR750S:~# iw reg get
global
country IT: DFS-ETSI
(2400 - 2483 @ 40), (N/A, 20), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
(5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
(5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
(5725 - 5875 @ 80), (N/A, 13), (N/A)
(57000 - 66000 @ 2160), (N/A, 40), (N/A)

phy#1
country US: DFS-FCC
(2400 - 2472 @ 40), (N/A, 30), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
(5250 - 5350 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
(5470 - 5730 @ 160), (N/A, 23), (0 ms), DFS
(5730 - 5850 @ 80), (N/A, 30), (N/A)
(57240 - 71000 @ 2160), (N/A, 40), (N/A)

phy#0
country US: DFS-FCC
(2400 - 2472 @ 40), (N/A, 30), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
(5250 - 5350 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
(5470 - 5730 @ 160), (N/A, 23), (0 ms), DFS
(5730 - 5850 @ 80), (N/A, 30), (N/A)
(57240 - 71000 @ 2160), (N/A, 40), (N/A)

I do not know what this means, actually, but it seems wrong to me that both phys stay on US.

Most importantly however, if I then click the “Channel Optimization” button in the web GUI for the 5GHz network, the Slate consistently chooses to use a channel above 140 and then just disappears, because channels above 140 are not allowed here in Italy and my PC will not scan for networks there.

This is obviously not working as expected, is there anything else I could try to force it to use the given Country setting?
Any help would be very much appreciated.
Thanks!

robert