Thanks, i did all what you described and find this in the logs

2019-07-11 16:45:05.588 Error: Zigbee hardware (3) thread seems to have ended unexpectedly
2019-07-11 16:45:19.595 Error: Zigbee hardware (3) thread seems to have ended unexpectedly
2019-07-11 16:45:33.598 Error: Zigbee hardware (3 ...

Hello,
I'm new to zigbee2mqtt and got myself a CC2531 USB stick with some aquara stuff.
I used the https://www.domoticz.com/wiki/Zigbee2MQTT manual to install this on my pi

Everything went fine and a paired one device which now shows up in the zigbee2mqtt.service logging

I installed the ...