Follow 557 back to the Rifugio Coldai, then on to the Col dei Baldi, and then back up trail 561 to the top chairlift station, and from there on the chairlift back down to Alleghe (if you aren't chairlifting it down, then there is a trail which descends from the col down towards Alleghe).
Congratulations - you've completed a challenging route!
Quick Reference Ferrate Route Index
rating from the newer Cicerone Guide by Fletcher and Smith
(**) Difficulty rating from older Cicerone Guide by Hofler/Werner