Go to Pioneer's website.
Select Support.
Under Car, select GPS Navigation.
At ths top of the list, there is a button saying "View Previous Models".
Scroll down to the Z120BT
Select the link for the Firmware Update. (2.003)
There you go....
http://www.pioneerelectronics.com/PUSA/Car/GPS-Navigation/AVIC-Z120BT?tab=firmware
Ian