CC2652 won't work

I just recieved my new zigbee2mqtt stick, but am unable to get it to run …

So, i bought this suggested and officially supported stick https://www.tindie.com/products/slaesh/cc2652-zigbee-coordinator-or-openthread-router/#product-reviews to replace the old cc2531.
I changed the pan_id from 1234 to 1235 as suggested and left everything else the same.
however, if I restart the addon (or home assistant altogether), the zigbee2mqtt logs say:

Zigbee2MQTT:error 2020-12-16 22:11:33: Error while starting zigbee-herdsman
Zigbee2MQTT:error 2020-12-16 22:11:33: Failed to start zigbee
Zigbee2MQTT:error 2020-12-16 22:11:33: Exiting...
Zigbee2MQTT:error 2020-12-16 22:11:33: Error: Error while opening serialport 'Error: Error: No such file or directory, cannot open /dev/ttyACM0' at Znp.<anonymous> (/zigbee2mqtt-1.15.0/node_modules/zigbee-herdsman/dist/adapter/z-stack/znp/znp.js:136:32) at Generator.next (<anonymous>) at /zigbee2mqtt-1.15.0/node_modules/zigbee-herdsman/dist/adapter/z-stack/znp/znp.js:27:71 at new Promise (<anonymous>) at __awaiter (/zigbee2mqtt-1.15.0/node_modules/zigbee-herdsman/dist/adapter/z-stack/znp/znp.js:23:12) at SerialPort.<anonymous> (/zigbee2mqtt-1.15.0/node_modules/zigbee-herdsman/dist/adapter/z-stack/znp/znp.js:134:49) at SerialPort._error (/zigbee2mqtt-1.15.0/node_modules/zigbee-herdsman/node_modules/@serialport/stream/lib/index.js:198:14) at /zigbee2mqtt-1.15.0/node_modules/zigbee-herdsman/node_modules/@serialport/stream/lib/index.js:242:12
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm 
ERR! [email protected] start: node index.js
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2020-12-16T21_11_33_425Z-debug.log
2020-12-16T22:11:34: PM2 log: App [npm:0] exited with code [1] via signal [SIGINT]
2020-12-16T22:11:34: PM2 log: App [npm:0] starting in -fork mode-
2020-12-16T22:11:34: PM2 log: App [npm:0] online

Then it tries again, but just repeats this over and over.

My hardware is a RPi 3 B+, running Home Assistant OS 5.8, Home Assistant 2020.12.0 and Zigbee2mqtt version 1.16.1

What am I doing wrong?