Hello,
today i did a new SD-Card as showed in the Duet Doku. It was susessful, i Formated, made the Folders and put it in the Duet. With USB connected i made Firmware Update and i can now connect to my Duet without the Raspi.
Many Thanks to Chrishamm and DC42 
Hello, Thanks for your Help Chris,
My Problem is, with USB- Cable and YAT i can not start the WiFi, no chance. When i try to start Wifi, an Error comes and tells, no Network Things in SBC Mode, so without Raspi you have no Chance to switch to Standalone Mode. Is that right ?
Greetings
Hello,
i did configure my Duet3 mini5+ wifi as sbc a long time ago, now i want toswitch to standalone mode, how do i do this ?
greetings