Just a quick note about the new ROM and installing old Bluetooth devices: the new ROM insists you put in a password if you are using a serial port, which makes it very difficult to communicate with devices (such as the GPS i have) that don't use encryption...
The trick is to tell the serial port NOT to use encryption (a checkbox in the advanced menu for serial ports), and make sure that everything got setup right... I had to try about 10X before the GPS unit connected correctly... (very frustrating)... But.... I finally got it right!
Good luck everyone who is updating or getting a new MDA!
Manny