Here is the final firmware updater tool for the General Dynamics R2600 
units. I tested the utility on my R2670B, and it upgraded to V7.02.I01. 
I have attached a screenshot. I have also attached the flash PDF file, 
which is embedded in the installation, but is not accessible until after 
it has been installed.

The RAR file and ZIP file should be identical. Unpack either one, click 
on the "SETUP.EXE" file, and follow the directions.

The PNG file is a screen shot showing the various firmware versions.