Brother route is simple,its on margalla hills... take road from F6 murghzar zoo and don't leave this road till sangda(a small bazar on monal-haripur road) via damn-e-koh, pir sohawa,monal, Sangda... From sangda bazar, there is a paved small road on right hand, take this road, this road straight leads to nilan bhotu......
our trip to nilan bhotu
https://www.pakwheels.com/forums/biking/249315-bike-trip-islamabad-nilan-bhotu-kpk-through-margalla-hills-june-2013-a