Tried the latest version, still no lucky with the Wi-Fi, but I noticed this:
iw reg get
global
country 00: DFS-UNSET
(755 - 928 @ 2), (N/A, 20), (N/A), PASSIVE-SCAN
(2402 - 2472 @ 40), (N/A, 20), (N/A)
(2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
(5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN
(5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
phy#0 (self-managed)
country 00: DFS-UNSET
...
And I was not able to set the country for phy#0 at all. I've tried iw reg set BR but will only change global, but phy#0 will stay the same.
Also, this config is lost once I reboot.
In the legacy version, this configuration is fine:
...
phy#0 (self-managed)
country BR: DFS-UNSET
...