updating firmware on arduino wifi shield I'm trying to upgrade firmware on my wifi shield by following the upgrade instructions for Mac. I was wondering what this means?:


  Connect a jumper on the J3 connector, that put the shield in the programming mode. Then connect the USB cable to the shield USB mini socket


How can I do this?
A "jumper" is a little piece of metal (or a 0-ohm resistor) that connects two pads or pins together. So, create an electrical connection across J3 ("DFU programming jumper" in all the pictures). You will then be able to program the shield via USB.