I cannot get this to work on Pi Zero W either...
I followed the instructions above with piCore 9.0.3 but wifi.sh says "No wifi devices found!" and when I do "iwconfig wlan0" I get the message: "wlan0 no such device"
I followed the instructions above with piCore 9.0.3 but wifi.sh says "No wifi devices found!" and when I do "iwconfig wlan0" I get the message: "wlan0 no such device"