By resetting firmware, you mean totally resetting the device (Factory reset)?
As the device is located in my summerhouse, I am afraid that I would not be able to reach it again, unless it is sure that it will register via the Goodcloud so that I can reach it there?
So, finally able to go the summerhouse and reset the device, unfortunately it did not help.
I fully reset it and set it up again from scratch (no saved config), but still the Wifi is not showing. Not sure what to read from the logs:
Sat Nov 16 10:47:01 2024 daemon.notice netifd: Wireless device 'radio0' is now down
Sat Nov 16 10:47:02 2024 daemon.notice netifd: radio0 (20964): sh: acs_survey: out of range
Sat Nov 16 10:47:02 2024 daemon.notice netifd: radio0 (20964): sh: acs_survey: out of range
Sat Nov 16 10:47:02 2024 daemon.notice hostapd: Configuration file: /var/run/hostapd-phy0.conf (phy wlan0) --> new PHY
Sat Nov 16 10:47:03 2024 kern.info kernel: [ 2758.648882] br-lan: port 2(wlan0) entered blocking state
Sat Nov 16 10:47:03 2024 kern.info kernel: [ 2758.654489] br-lan: port 2(wlan0) entered disabled state
Sat Nov 16 10:47:03 2024 kern.info kernel: [ 2758.660358] device wlan0 entered promiscuous mode
Sat Nov 16 10:47:03 2024 daemon.notice hostapd: wlan0: interface state UNINITIALIZED->COUNTRY_UPDATE
Sat Nov 16 10:47:03 2024 daemon.notice hostapd: ACS: Automatic channel selection started, this may take a bit
Sat Nov 16 10:47:03 2024 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->ACS
Sat Nov 16 10:47:03 2024 daemon.notice hostapd: wlan0: ACS-STARTED
Sat Nov 16 10:47:04 2024 daemon.notice netifd: Wireless device 'radio0' is now up
Sat Nov 16 10:47:09 2024 daemon.notice hostapd: wlan0: ACS-COMPLETED freq=2437 channel=6
Sat Nov 16 10:47:09 2024 daemon.notice hostapd: wlan0: interface state ACS->HT_SCAN
Sat Nov 16 10:47:11 2024 kern.info kernel: [ 2766.871870] br-lan: port 2(wlan0) entered blocking state
Sat Nov 16 10:47:11 2024 kern.info kernel: [ 2766.877394] br-lan: port 2(wlan0) entered forwarding state
Sat Nov 16 10:47:11 2024 daemon.notice netifd: Network device 'wlan0' link is up
Sat Nov 16 10:47:11 2024 daemon.notice hostapd: wlan0: interface state HT_SCAN->ENABLED
Sat Nov 16 10:47:11 2024 daemon.notice hostapd: wlan0: AP-ENABLED