for the DG i have firmware files - rigols content delivery system is not the best ;-) even if its not on the homepage you can still download stuff ... ;-) including internal vids ...
I took a look and found all the training videos, sales tool kits and other files. However, I could only find one firmware file. It is for the DG4000 series (DG4000_FW_Update.zip).
It can be found via "113" if you know what I mean...
Can you share where the other firmware files are located?
The DG4000 firmware zip contains the file DG4000Update.GEL, dated 20/3/2012. There doesn't seem to be a readily identifiable version number in it, other than version 1.2.3a. However, it appears as though it is a generic number as it also has a serial number of 543210.
I have a DG4162 and its details are:
Software: 00.01.07 (suspect there is more to it)
Hardware: 01.03
Keyboard: 04.01
I also have a DS4024 and its details are:
Software: 00.01.00.00.07
Hardware: 0.1.2.3
SPU: 03.00.06
WPU: 00.07.04
CCU: 01.40.05
MCU: 1.3
I can dump the contents of the FRAM if it helps.