Hi, you were right, I needed to reboot the Orange Pi Zero after commenting out the interfaces file to start the nmtui and nmcli. Now, I am able to get the network lists and activate the proper Wifi connection. All mentioned problems, that I reported as bugs are gone. Thanks a lot for priceless advice - I have spent nearly 9 days playing with Wifi settings, before I wrote these lines into forum. The last thing: OPIz is connected via wifi to router, but SSH gives me Network error: Connection timed out. Ethernet works fine, though. Thanks in advance.