Try the following command sequence:
git lfs uninstall
git reset --hard
git lfs install
git lfs pull
In case if this is not working (because this was not working for me), the following hack may work:
git rm --cached -r .
git reset --hard
git rm .gitattributes
git reset .
git checkout .
More info: https://stackoverflow.com/a/54804224/4758602