Bluetoth connects! Wifi not, till I use a Wifi-USB-Stick.
ip link output shows lo and eth0 but no wlan0.
Can’t show original output without using a very long LAN cable.
Your cat /proc/cpuinfo tells me, you took the false horsename
For me it works using a stick. But perhaps it will be useful for others using plasma on rpi3.
Please tell me if I can do some more investigations on this.