There are 2 ways to do that
$ git checkout master
$ git pull
$ git reset --hard tag_ABC
$ git push --force origin master
$ git checkout 1.1.1
$ git diff master > ~/diff.patch
$ git checkout master
$ cat ~/diff.patch | git apply
$ git commit -am 'Rolled back to version 1.1.1'
$ git push origin master
nice! thanks man