Hey there.
Updated my Raspberry Pi 3 to 6.21.1 today and now Wifi is not working anymore.
No supported Wifi Hardware was found.
Would you like to disable WiFi?
- (NOTICE) Connections may drop!
Please help.
Maybe wpa_supplicant is crashing this…
ifup wlan0
wpa_supplicant: /sbin/wpa_supplicant daemon failed to start
run-parts: /etc/network/if-pre-up.d/wpasupplicant exited with return code 1
ifup: failed to bring up wlan0
during dietpi-update apt updated wpa_supplicant…
kernelmodules were missed
Can you tell what you did to solve the problem??? Thanks.
By default, on DietPi WiFi modules are blacklisted. You need to enable WiFi either before first boot, via dietpi.txt or afterwards, via dietpi-config.
Otherwise one can manually remove the blacklists in /etc/modprobe.d/disable_wifi something like that 
.