The jumper is only neccesary if your device is not R3 (revision 3)
Be carefully if you connect the shield and your computer does not
recognice the port.
You gonna need a driver in the link below there are all the steps
include other links to download software as Flip 3.4.7 who has
the executable batchisp which one you can made the changes
read the web site:
and extra information about that in official site of arduino
WiFi Shield Firmware Upgrading
there you gonna have an idea how to do it.
for me was more clear as in this site describe everything
and also teach to probe if there is an update
having sucess in the process to installing something it
could be as a question answered with non the specific
thing you need.
I am also in the process to update my device if I will have success
I will write to how I do it.
At the moment reading a bunch of differents forums beacuse arduino team itself
appearently had some troubles to provided a guided how to do it sucessfully.