Rigol firmware available here - http://int.rigol.com/Support/SoftDownload/3
Website was not working for me.
Edit: the reason was Chrome, on Internet Explorer it is working fine.However on the Rigol site you can
request a firmware. It took only 5 minutes, than I got an individual download link (will be invalid soon, thats why I am not posting it here) by mail.
Not a lot of changes, thus not worth for installing for most of us. The release note says:
Version 00.01.16.00.03 from 18.05.2016:1. Added support for new models DSA705 and DSA710.
2. Solve the bug of command “:SENSe:TPOWer:MODE?” returned wrong result
3. (AE 201512000256)Solve logarithmic abscissa save csv data error problem
Version 00.01.15.01.00 from 25.12.20151. Match performance for hardware revision 01.05 with older hardware revisions
(whatever that means).Many enhancements and modifications were made on revision
00.01.15.00.00 from 23.10.2015.
At least this 1.15.00 version should be installed on your DSA815.Edit: I installed 1.16 on mine, everything seems OK, options are still there. There is a new (inactive) option now showing I did not recognize before called "2FSK-DSA800". So probably a new option with addl. functionality to analyze and demodulate 2FSK signals will be available.