Please attach (do not paste into comment) the output of "lsusb -vv".
You could also try other firmware versions by reading /lib/firmware/`uname -r`/acx/readme.txt
Please attach (do not paste into comment) the output of "lsusb -vv".
You could also try other firmware versions by reading /lib/firmware/ `uname -r`/acx/readme.txt