Please advise if I can downgrade the firmware having only an Ethernet connection to the adapter.

I lost access to the portal and wifi connectivity after a firmware upgrade. The tpPLC Utility shows the device.

The firmware has been downloaded from this link - https://static.tp-link.com/upload/firmware/2023/202307/20230705/TL-WPA8630(US)_V2_230427.zip

Thanks