In my case I tried many things but nothing works out. Then I tried following:

First of all I was unable to install FirebaseCrashlytic updated version due to interdependency of FirebaseCrashlytics, FirebaseMessaging and GoogleUtilities. So I have to update first Minimum iOS Target version in Project and also in Podfile, then I would be able to update latest FirebaseCrashlytics and then my dSYM file successfully upload and finally I can see crash reporting on Firebase Crashlytic console.