RangePi - LoRa USB-dongle gebaseerd op RP2040 (EU868)

The board seems to be a nice little board for LoRa testing. I have purchased one but having big problems to program it. I have followed the instructions and pressed the BOOTSEL button when plugging it in and I only get a serial device and no mass storage.

Is there someone out there that is able to help me and guide me in the right way. I have tried on my Apple Silicon Mac with macOS and with Windows. I have also tried on an Intel Mac and on a Windows PC. I have tried with different cables and ports. But no luck in any case. I have also tries with another RangePi with same results.

Is it possible to re-flash the device in someway or can I do something else to be able to connect to it?