Source: https://gist.github.com/sagarjethi/c07723b2f4fa74ad8bdf229166cf79d8
Delete the last commit
For example your last commit
git push origin +aa61ab32^:master
Now you want to delete this commit then an Easy way to do this following
Steps
First reset the branch to the parent of the current commit
Force-push it to the remote.
git reset HEAD^ --hardgit push origin -f
For particular commit, you want to reset is following
git reset bb676878^ --hardgit push origin -f