From below the hamlet of Cornello, follow the ex provincial road and cross the iron bridge which crosses the river Brembo. Upon arrival in the village of Grumo follow the tracks on the left towards the Church. Once you have reached the white Church of San Rocco (with portico) continue towards the hamlets of Bosco Dentro and Bosco Fuori. From Bosco Fuori you encounter the most wild stretch of this route, there are many paths which intermingle and it is important not to lose track of the main route. Cross the intersection with the road which leads to Miniere del Paglio and continue southwards until you arrive in the vicinity of Colle di Dossena.