I'm using 1.8.1 on a RP4. Trying to change the wifi with raspi-conf returns "There was an error running option S1 Wireless LAN". I've tried editing /etc/wpa_supplicant/wpa_supplicant.conf and running wpa_supplicant -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf