I have a Precision M6500 that shipped 1/18/2011. It has the DW1520 Half Mini-Card. I tried to install the Intel wireless display driver and got an error message that my wireless hard does not support WiDi. is it posible to upgarde my firmware on the DW1520 in order to be able to use WiDi?

http://www.intel.com/support/wireless/wtech/iwd/sb/cs-031059.htm

You would have to replace your WLAN mini-PCIe with one of the following:

Intel® Centrino® Wireless-N 1000, 1030
Intel® Centrino® Advanced-N 6200,
6205, or 6230
Intel® Centrino® Wireless-N + WiMAX 6150
Intel® Centrino® Advanced-N + WiMAX 6250 
Intel® Centrino®
Ultimate-N 6300