Hi,
I've tried flashing the motor controller with the unlocked firmware but it didn't work.
Same error as many people have here: Red bar on top + 0 kmh with no function at all.
So now I've set my mind on tinkering with the stock hardware.
Connecting the COM box worked quite well.
A self-made adapter and an old USB-cable did the trick.
The box is identified as a "Remote NDIS based internet sharing device". It appears as a device connected via ethernet.
It also has an IP that responds to pings. An internet connection is not present, since I've removed the SIM card (no need to be tracked by a company on my own scooter).
Unfortunately, connections via the internet browser are denied by the COM box.
Connections from the file explorer are not denied, but no files are visible.
I think maybe the full USB functionality can be unlocked by specific UART commands. Then, it might be possible to access the firmware, sound files and other artifacts.
Hopefully this helps someone here, since I don't really have much knowledge about network devices.