If you check the version listing thread in the "Sticky" section, you'll see where I list all the versions. The one you are requesting must be the original f/w on the V5 when it was shipped. Unfortunately, there was no way to get it off my V5.
However, the future versions all improved on it as I list in that message. I do have all the other versions, and have recently found a way to make them available to people if they want them.
ps, if I don't respond to you here, send me a PM as I don't always check the Astak section.