I bought a new RPI, now it works Fine

Now i have checked the Resistence of the ribbon cable and its all ok. The First Time After i configurate the duet and the sbc (it worked) i plugged it wrong way and Powered it. is it possible something is damaged?

I checked it, its the 3.2.2 RRF. Now i order a new Ribbon cable, to Check if its the problem. Thank your for your help

Now I have tried it from step one without duetpi the Problem is, im not able to Set the buffersize, i dont have the authorization

Is it possible to Check the cable working Fine? Because When i Start without connected to the duet, its looking the same

The First Time i was updating over DWC. But i try severel times to Flash over Bossa. I try 3.1, 3.2, 3.3

Yes without sd in the duet3

Im using the supplied one. When i receive the Board its working fine, then i make a update over DWC ( zip file), now its not working. I Flash the pi some times (try Lite and normal) but its impossible to Start the Duet Control Server.
I do all how its here explaned:
https://duet3d.dozuki.com/Wiki/Getting_Started_With_Duet_3#Section_Updating_Duet_3_main_board_firmware

Hello, i try to work with an Duet 3 and a Raspberry Pi 3b+ but im not able to connect to the DWC. I dont have any idea how to fix this problem.

https://ibb.co/TcnC9Zp