Installing Microphython firmware with OpenMV fails

Official Hardware Nano Family Nano RP2040 Connect
1

I have a brandnew Arduino Nano RP2040, and I want to flash the firmware, so I can use micropython. That doesn't work, it stops with the error message

PicoTool firmware update failed!

The command "picotool" terminated with exit code 249

DETAILS
/home/6ffm70/etc/OpenMV_inst/share/qtcreator/picotool/linux64/picotool load -x /home/6ffm70/.config/OpenMV/qtcreator/firmware/ARDUINO_NANO_RP2040_CONNECT/firmware.bin

No accessible RP2040 devices in BOOTSEL mode were found.

but:

Device at bus 1, address 30 appears to be a RP2040 device in BOOTSEL mode, but picotool was unable to connect

I'm using this guide:

My environment: Ubuntu 20.04 on a Lenovo laptop; OpenMV IDE 2.9.2

What happens?
I start the IDE,

connect the Arduino with a microUSB cable (tried several different),

press the boot button on the Arduino twice (now the LED is constantly green, the computer recognizes a mass storage device)

I press connect, a window appears as per manual

I press OK, above error meassage appears.

Is there a workaround to not use OpenMV? Can I drag and drop ARDUINO_NANO_RP2040_CONNECT/firmware.bin via my file browser?

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