ubuntu chameleon mini firmware update

[Blck4]

liu@ubuntu:~/ChameleonMini/Firmware/Chameleon-Mini$ sudo avrdude -c flip2 -p atxmega128a4u -B 60 -P usb -U application:w:Chameleon-Mini.hex:i -U eeprom:w:Chameleon-Mini.eep:i

avrdude: Error: No matching USB device found
avrdude: AVR device initialized and ready to accept instructions

Reading | | 0% 0.00savrdude: error reading signature data for part "ATxmega128A4U", rc=-1
avrdude: error reading signature data, rc=-1

avrdude done. Thank you.

why? I have pressed tinty B to plug in usb and entered dfu mode.

[guycalledseven]

Are you sure you are in DFU mode? I was able to flash it in ubuntu (on macOS under Parallels), but I entered DFU by connecting via socat and manually issuing upgrade command:

socat - /dev/ttyACM0,crnl,raw,echo=0
upgrade

Then I was able to use avrdude to backup and flash new.