@taconite said in Duet 2 WiFi: 3.1.1, 3.2.2 upgrades fail, 3.0.0 works ok:
For Duet2 Wifi it happens that the Wifi Server FW gets corrupted and needs to be installed manually (e.g. via Pronterface). This happend to me multiple times from 3.0.0 onwards.
Manually sending M997 S1 to re-flash the wifi module usually does it.