ETRX357USB-LRS+8M possible to use with hassio? Any idéas?

Hi
I have:

  • a pi4
  • usb stick “telegesic ETRX357USB-LRS+8M” (silicon labs)
  • fresh working installation of raspbian + docker + hassio
  • the stick is identified in hassio->system->hardware as /dev/ttyUSB0 ( I dont use any other USB sticks…)

I try to add zha through “Integrations”, pointing to /dev/ttyUSB0. It seems to try approx 10s, but then always says “unable to connect to zha device”

Anyone? I have read about flashing, but cant seem to see any official firmware and also reading about people that has bricked the device and no confirmation it will work in HA after flashing…