If you change your wifi pasword, raumfeld devices behave a bit retarded. As they already know a password for this ESSID they assume they should use this. It is not asked for a new… Resetting didn’t work for me. Connecting to another ESSID and then again to the old worked sometimes.
If this doesn’t work:
connect the device to wired network
first enable wifi deamon via special file on a pendrive
now it should work again…