The FlutterFire packages do not properly follow semver, and all packages must be on the versions released together. This causes issues downgrading a package, as it will be incompatible with the other FlutterFire packages. The ffvm tool aims to solve this by allowing you to specify what package and version you want to use, and it will lock all the other packages to the appropriate versions.
Lock all FlutterFire packages to versions compatible with the specified package and version
dart pub global activate flutterfire_version_managerffvm <package> <version>Hopefully in the future this package will not be necessary
If you maintain any third party FlutterFire packages that are affected by this, please create an issue and I will add them to the list of packages that are locked