Use Battery Device USB as Virtual COM

Run:

cd /sys/class/android_usb/android0

echo acm > functions

echo 1 > f_acm/instances

echo 1 > enable

The device created on the Kitra520 is ttyGS0.

Plug the USB cable of battery, you will get a new Virtual COM on your PC host.

You can also enable the linux terminal on that USB by executing:

agetty ttyGS0