My Xiaomi AX3600 (IPQ8074) signal is very weak

Installing and Using OpenWrt
1

I bought the Mi AIoT Router AX3600 a long time ago but just turned it on.
And after using it for 1 day, the Wi-Fi disappeared for both 2.4 and 5, but the Port Lan can still function normally.

After trying to solve the problem Tried using both Global and CN frameworks and the WiFi still disappeared.

After that I tried installing OpenWrt by experimenting with IPQ8074 in both AX/AC/N mode.
But found that the computer searched for the SSID but found a very weak signal. The mobile phone cannot be found. No matter how you try to adjust the Channel or strength.

The QCA9887 works fine and my mobile phone connects to it normally.

Is my IPQ8074 broken?

Model	Xiaomi AX3600
Target Platform	qualcommax/ipq807x
Firmware Version	OpenWrt SNAPSHOT r27137-f51cb74473 / LuCI Master 24.212.79282~65b8002

root@OpenWrt:~# cat /etc/config/network

config interface 'loopback'
        option device 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fdb4:9f1e:4fdd::/48'

config device
        option name 'br-lan'
        option type 'bridge'
        list ports 'lan1'
        list ports 'lan2'
        list ports 'lan3'

config interface 'lan'
        option device 'br-lan'
        option proto 'static'
        option ipaddr '192.168.3.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wan'
        option device 'wan'
        option proto 'dhcp'

config interface 'wan6'
        option device 'wan'
        option proto 'dhcpv6'

root@OpenWrt:~# cat /etc/config/wireless

config wifi-device 'radio0'
        option type 'mac80211'
        option path 'soc@0/20000000.pci/pci0000:00/0000:00:00.0/0000:01:00.0'
        option band '5g'
        option channel 'auto'
        option htmode 'HT40'
        option cell_density '0'
        option country 'TH'

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option ssid 'OpenWrt-QCA9887'
        option encryption 'none'

config wifi-device 'radio1'
        option type 'mac80211'
        option path 'platform/soc@0/c000000.wifi'
        option band '5g'
        option channel '44'
        option htmode 'VHT160'
        option country 'TH'
        option cell_density '0'

config wifi-iface 'default_radio1'
        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option ssid 'OpenWrt-5G'
        option encryption 'none'

config wifi-device 'radio2'
        option type 'mac80211'
        option path 'platform/soc@0/c000000.wifi+1'
        option band '2g'
        option channel '1'
        option htmode 'HT40'
        option cell_density '0'
        option country 'TH'

config wifi-iface 'default_radio2'
        option device 'radio2'
        option network 'lan'
        option mode 'ap'
        option ssid 'OpenWrt-2.4G'
        option encryption 'none'