Octopus 1.1 detected but unrespnsive

Hey everyone,

I´m having big problems setting up Klipper on my mainboard.

The problem: Donig the RatOS configure?step=1 I need to flash klipper to my Octopus. Doesn´t matter if I do it via SD card (always on the first try) or flash automatically (available after the first try). It always comes down to "Octopus V1.1 detected but is unresponsive.
Klipper doesn't seem to be running on your board, which may indicate faulty firmware or a faulty board. Please check your board and try flashing it again." In this window Mainsail always has a green light at the top. Klipper sometimes does - i have no clue why, cause it never works.

Steps I´ve taken:
Disconnect all Jumpers/wires from the board
Update the DFU Bootloader via BTT´s instructions
Reinstalled RatOS on the Pi (two times, 64 and 32 Bit)
Tried 3 known good USB-C to A Cables
Looked at the dmesg -w (seems fine to me: Product: STM32f466xx, Manufacturer: Klipper, Serial Number: btt-octopus-11)
Tried BTTs Klipper Version via Micro SD
The printer configuration is empty, only including the ratrig standard. The ratrig standard config.

All had no effect on the erro and I didn´t get an insight on whats wrong.

I´m completly new to klipper and basically helpless at this point. Can someone help my, giving me further steps?
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