You did not create the software for that. Russia is now transferring the original firmware of Yakhont which Brahmos is.
The step by step increase in range is more to do with political impact of such increase than any technicalities.
The clue was in the size and weight of the missile. A 300 Km cruise missile missile of 3 ton weigh makes no sense. It was another Yakhont with same machinery and even fuel .
There wont be any more range increase than 600 Km as that's what the missile can do.
The software was created by India in 2006 to Reduce range of Brahmos as initial tests failed to hit targets of reduced range.
Now increasing the range will be a walk in the park as original software is to be installed without modification.
The target envelop of Yakhont is 450-600 Km .
http://www.brahmos.com/newscenter.php?newsid=67[/QUOTEdo brahmos has this capabilities now?