Posted by Turrican on Feb 21, 2016; 5:32am
URL: https://itus.accessinnov.com/How-do-I-completely-reset-tp131p134.html

If you're using a usb to serial adapter in conjunction with your serial cable then download these device drivers if they're not already installed. http://www.prolific.com.tw/US/ShowProduct.aspx?pcid=41&showlevel=0041-0041

Then
1) Download putty from http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html
2) Connect the console cable to the Shield.
3) In Putty, set the Serial Line to COM3 (may vary, check device manager in Windows) and Speed to 115200. Or if you're on OS X do: screen /dev/tty.usbserial 115200
4) When you initially connect you'll get a blank screen. Just hit the enter key a few times to get a connection.

That's the easy part :)