incorrect route.

hi there. i have a question. i have garmin nüvi 67 lmt. with central europe. my problem is i have downloaded england map from osm byt it wont fint anyroute. it stucks at 80 precent. now i have also downloaded maps for macedonia and serbia. and this works. how can i fix this guys. thanks

i have no idea what i am supposed to write. i just need help with my navi