Ratos update 1.2.4.4 to 2.0.2 - no Klipper connection

I tried a 4th attemp to do an upgrade to the latest RatOS version. With the same result as ever. No klipper connection.
Current setup RPi4 - Octopus 1.1 with all heaters, drivers & sensors etc connected. (I didn't disconnect anything before, during, after upgrade)
When I succesfully automatically or manual (same result) the Octopus board during the setup and want to proceed to the mainsail screen after step 3 I don't get Klipper responding. Thus not able to access the mainsail interface.

When I tried to reflash the MCU or simlink (3dots) I even don't get this working.

Did I overlook anything? Should I remove alle cables, stepper drivers, ... during the installation of RatOS 2.x?

I don't get it, thank you
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