RatOS wizard problems

Hi, I started the install wizard with RatOS-v2.0.2, I have Raspberry Pi 4 and Octopus v1.1. The Wi-Fi connected without a problem, but I can't flash the board with the USB-C cable.
I read here that I should use RatOS-v2.1.0-RC2. I updated it to this version, and now I can't connect to the wifi or flash the board.
How can I solve this? I really don't want to buy a new SD card just to flash the board.
Any ideas on how to solve it?
Thanks
Update: I flashed RatOS-v2.1.0-RC2 with Balena Etcher 18.0 and the wifi connected, however, the octopus v1.1 still can't flash automatically or with the DFU with the error: "Status: DFU not detected"
Solution
The jumpers for the fan voltage and for the probe voltage should not matter, I had not removed them either. But I would remove the jumpers for the drivers and try again. Also switch off the Pi.

Sequence:
Switch everything off
Remove the jumpers for the drivers
Plug the board into the Pi
Switch on the Pi
new attempt with RatOS wizard via manual DFU, not via autodetect
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