the last few days i have been looking for a solution to my problem but unfortunately didn't find one.
I'm trying to get my JTAGICE3 running on OS X 10.15 Catalina. Unfortunately OS X take over the device and therefore it is no longer usable for avrdude.
avrdude: usbdev_open(): error claiming interface 0: Permission denied avrdude: usbdev_open(): no usable interface found avrdude: jtag3_open_common(): Did not find any device matching VID 0x03eb and PID list: 0x2110, 0x2140
During my research I came across the signed AtmelICE kext file by Nicholas Sayer which unfortunately contains a different device ID.
My JTAGICE3 has the DeviceID 0x2140 (8512 decimal) but the kext file is for 8513 decimal.