http://www.america.htc.com/support/mogul/software-downloads.html
NOTE: The ROM update version 2.16.651 posted on 10/24/2007 which had
Bluetooth fixes has been removed. Update 2.16 caused some unanticipated
conflicts in device performance. The Bluetooth fixes will be added to a
future ROM update expected in early 2008. If you already updated your device
to version 2.16, you can restore your device to the prior version by
installing the file posted below. Please bookmark this webpage for future
so