Here's what I get when I list my devices (BTW, I couldn't find where the list command was documented)
C:\Program Files (x86)\Atmel\Studio\7.0\atbackend>atprogram list simulator No serialnumber found edbg ATML2130031800039366
And then here's the command line I try:
C:\Program Files (x86)\Atmel\Studio\7.0\atbackend>atprogram -t edbg -i SWD -d ATML2130031800039366 -v program -c -f Flasher.elf [DEBUG] Starting execution of "program" [DEBUG] Starting process 'C:\Program Files (x86)\Atmel\Studio\7.0\atbackend\atbackend.exe' [DEBUG] Connecting to TCP:127.0.0.1:62503 [INFO] Connected to edbg, fw version: 3.25 Firmware check OK [INFO] Firmware check OK [ERROR] Could not set device properties. Make sure you have selected correct device and interface, and that the hardware connections are correct.