Hi Sadeep, > I added the following to /etc/udev/rules.d/99-avrprogrammer.rules and > restarted the machine: > > SUBSYSTEM=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="05dc", GROUP="uucp", MODE=="0666" Have you browsed https://wiki.archlinux.org/title/Udev ? It may have some useful tips on monitoring what's happening. -- Cheers, Ralph.