Wifi stopped working suddenly

Hello,

A few hours ago, Wifi has stopped working on my router. I have tried to Restart the interfaces and disable/enable the Wifi networks, restart the Router itself but none of this helped. When I click Scan in the Radio0 and Radio1 settings, nothing is found. As far as I understand OpenWrt doesn't auto-update itself and this router has been working flawlessly for the past months. I do not understand what happened. Can you help me resolve this issue?

|Model|ASUS RT-AC65P|
|Architecture|MediaTek MT7621 ver:1 eco:3|
|Firmware Version|OpenWrt 21.02.1 r16325-88151b8303 / LuCI openwrt-21.02 branch git-21.295.67054-13df80d|
|Kernel Version|5.4.154|

I checked the logs and found these lines:

Mon Apr 25 10:28:50 2022 daemon.notice hostapd: Configuration file: /var/run/hostapd-phy0.conf (phy wlan0) --> new PHY
Mon Apr 25 10:28:50 2022 daemon.err hostapd: Could not set interface wlan0 flags (UP): I/O error
Mon Apr 25 10:28:50 2022 daemon.err hostapd: nl80211: Could not set interface 'wlan0' UP
Mon Apr 25 10:28:50 2022 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Mon Apr 25 10:28:50 2022 daemon.err hostapd: nl80211 driver initialization failed.
Mon Apr 25 10:28:50 2022 daemon.notice hostapd: wlan0: CTRL-EVENT-TERMINATING
Mon Apr 25 10:28:50 2022 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Mon Apr 25 10:28:50 2022 daemon.notice netifd: radio0 (2151): Command failed: Invalid argument
Mon Apr 25 10:28:50 2022 daemon.notice netifd: radio0 (2151): Device setup failed: HOSTAPD_START_FAILED
Mon Apr 25 10:28:50 2022 daemon.notice hostapd: Configuration file: /var/run/hostapd-phy1.conf (phy wlan1) --> new PHY
Mon Apr 25 10:28:50 2022 daemon.err hostapd: Could not set interface wlan1 flags (UP): I/O error
Mon Apr 25 10:28:50 2022 daemon.err hostapd: nl80211: Could not set interface 'wlan1' UP
Mon Apr 25 10:28:50 2022 daemon.notice hostapd: nl80211: deinit ifname=wlan1 disabled_11b_rates=0
Mon Apr 25 10:28:50 2022 daemon.err hostapd: nl80211 driver initialization failed.
Mon Apr 25 10:28:50 2022 daemon.notice hostapd: wlan1: CTRL-EVENT-TERMINATING
Mon Apr 25 10:28:50 2022 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan1 wasn't started
Mon Apr 25 10:28:50 2022 daemon.notice netifd: radio1 (2152): Command failed: Invalid argument
Mon Apr 25 10:28:50 2022 daemon.notice netifd: radio1 (2152): Device setup failed: HOSTAPD_START_FAILED

That looks a lot like an actual hardware-failure. Do you have a possibility of trying the stock firmware? If it exhibits a similar problem, then yeah, the hardware has died.

I can roll back to stock firmware to test it, though that will nuke OpenWRT. Does the "Backup" feature in OpenWRT save my entire config?

It should, yes.

Thanks. I will give it a try later. Unfortunately I cannot pull the router from the network just yet.

I managed to restore the ASUS firmware. Both 2.4/5ghz wifi interfaces are working. So what the hell happened with OpenWRT? o.O

In the screenshot, it says you've got 21.02.1 installed. Did you try with the 21.02.3 that was just released? I seem to recall someone mentioning something about some bugfixes for Mediatek WiFi.

As for what happened, I have no clue. At least you verified the hardware works, so that's something.

I will install v21.02.3 in few days and see how it goes. Thank you for the suggestion.

I will post an update as soon as I can.