If you go to www.bgmaps.com
and put in fotinovo on a search in the places in bulgaria search it will hightlight the village. I drove from Rosova through Ravnagor hoping to ge to Batak lake , the road after Ravnagor which is quite a busy village, was tarmac and it carried on, but somewhere along the route we lost our way and didnt find Batak.
There were road signs to Fotinovo but cant tell you where the road runs out. The villages up there are working villages and relatively up to date in rural terms, everyone has a mobile phone, and very friendly, we last went in autumn and it was very beautiful but I cant be sure where the tarmac runs out! The black roads are very wide, but full of pot holes so I guess it depends on your driving mabye someone else has explore up there and can tell us both more!