Other way to read out the Serial Number & Device ID?

Routers
4

You can see them in Admin Panel → APPLICATIONS → GoodCloud.

Also, you can run the command via SSH to get them:

curl -k http://127.0.0.1/rpc -H 'glinet: 1' -d '{"jsonrpc":"2.0","method":"call","params":["","system","get_info",{}],"id":1}'