The first flight of the Dhruv with the more powerful Shakti engines was on August 16, 2007. This version of the Dhruv is designated as the Mark III.  First flight of the Weapon System Integrated (WSI) Dhruv was also conducted on August 16, 2007.

Source: "From Chetak to Dhruv: The History of HAL Helicopters," Hirschberg, Mike, Published by AHS International,  Vertiflite, Spring 2011,  Page 51