2.4GHz WiFi not working

[rurus9]

Router: xiaomi AX3200 Model:RB01 (telnet default is on).

I did according to: https://openwrt.org/toh/xiaomi/ax3200 with firmware: http://downloads.openwrt.org/releases/22.03.0/targets/mediatek/mt7622/openwrt-22.03.0-mediatek-mt7622-xiaomi_redmi-router-ax6s-squashfs-factory.bin

The first recipe with:

nvram set ssh_en=1
nvram set uart_en=1
nvram set boot_wait=on
nvram set flag_boot_success=1
nvram set flag_try_sys1_failed=0
nvram set flag_try_sys2_failed=0
nvram commit

did not work, each time router boot to stock firmware, so I used:

nvram set ssh_en=1
nvram set uart_en=1
nvram set boot_wait=on
nvram set flag_boot_success=1
nvram set flag_try_sys1_failed=0
nvram set flag_try_sys2_failed=0
nvram set "boot_fw1=run boot_rd_img;bootm"
nvram commit

and after flash openwrt is booting.

It seems that everything works except 2.4 GHz WiFi (5GHz is OK).

From WebUI not working [Scan] for radio0 [2.4], after enable I have "Wireless is not associated"

After connecting via ssh to the router I saw this errors in dmesg:

root@OpenWrt:~#  dmesg | grep mt7622-wmac
[   29.286172] mt7622-wmac 18000000.wmac: Message 00000010 (seq 1) timeout
[   29.292789] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   29.516424] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   29.736303] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   29.956285] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   30.176279] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   30.396280] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   30.616265] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   30.836270] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   31.056384] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   31.276325] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
[   31.496294] mt7622-wmac 18000000.wmac: Failed to get patch semaphore
(...)

I tried to raise the radio interfaces using ip:

# wlan1 is 5GHz
# wlan0 is 2.4GHz
root@OpenWrt:~# ip link set wlan1 up
root@OpenWrt:~# ip link set wlan0 up
ip: SIOCSIFFLAGS: I/O error

Before flash to openwrt 2.4GHz works, after returning to the stock firmware works too.