I was able to solve the problem. Noticing /dev/ugen0.00 and /dev/ugen0.01 as last items in the output I tried:
$ doas chown user:users /dev/ugen0.00 $ doas chown user:users /dev/ugen0.01 $ adb kill-server $ adb devices * daemon not running. starting it now on port 5037 * * daemon started successfully * List of devices attached _redacted_ offline It made the device appear in the list, but it appears as "offline". Trying something like adb shell doesn't work. So I did something drastic: $ doas chown user:users /dev/ugen0.* This time it worked: $ adb kill-server $ adb devices * daemon not running. starting it now on port 5037 * * daemon started successfully * List of devices attached _redacted_ device I found <https://wiki.netbsd.org/scanner/> which had something more "drastic" than I did, changing permission for all /dev/ugen* for a scanner device. So I felt more comfortable applying permission to all /dev/ugen* now. I have my non root user already in the wheel group: $ groups users wheel operator So didn't see any point in creating a new group. I finally decided to make it work but keep it close to default NetBSD setup: $ doas chown root:wheel /dev/ugen0.* # restore my changes $ doas chmod g+rw /dev/ugen* # add group read write permission Now I can enjoy ADB and MTP without root priv. Problem solved! Haven't tried more modern Android versions yet. Also found <https://www.netbsd.org/docs/guide/en/chap-rmmedia.html#cdrom-users> which I can use to (un)mount using USB storage mode without root priv. Thanks for the help.
