I specifically registered on this site to send you this same file. I have both software version 2.0 and 2.5. There is even a 1st version (only it is not installed), but the problem is! Whatever firmware you put on the controller, your copter will not get in touch. I have two karmas and they react differently to mating. Somewhere the diode blinks, somewhere there is an error right away. I suppose you need to open the case, solder something and take the programmer. It's just not clear where the engineer who will say what to solder is. Alternatively, you should look for a working karma and do a dump. Perhaps this is the only option.
final88
In general, the forum is strange. Zero advice from everyone and only empty communication. It's a pity that the community never formed.