Hey, thanks for your reply. A friend gave me the advice after reading the hint with the root rights for the usb devices to put `sudo` in front of the ./cgminer command. Then my newpacs were recognized and the miner is now running successfully
The other possibility to enable usb devices for standard users are the commands provided in the pinned installation guide at page 1. Unfortunately yesterday I believed that the standard "pi user" has those rights, which was a wrong assumption...
Anyway thanks for your reply and have a nice weekend