As I understand it BEC no longer manufactures receivers. You most likely have the most recent version of firmware installed on the box as you are going to get. I did check the DMS site and found no mention of anything related to the BEC receivers.
The address is
http://www.dmsiusa.com
This is the US distributor of BEC receivers when they were making them. A note on the 2000: there are 2 of them and the software is NOT interchangable. You have either a 2000 or a 2000+. If you make the mistake your receiver will be rendered useless. Might be anyway once you start playing with software alterations in a working receiver.
I have a BEC receiver and like it quite well for what I paid for it. It sits upstairs in an unused bedroom at the moment
Have a great day
Steve