Do you want to roll back your repo to that state? Or you simply wish your local repo to look like that?
If you want your local repo to look like that use:
git reset --hard c14809fa
It will build your local code and local history be just like it had been at that commit. But then if you wanted to push this to some other person who has the new history, it'd fail.
if you do
git reset --soft c14809fa
It will move your HEAD to where they(the person has new commit) were, however leave your local files etc as the same. So what exactly do you want to do with this reset?
You can add "tags" to your repo.. then return to a tag.
But a tag is really just a shortcut to the sha1.
You can tag this as TAG1.. then a git reset --soft c14809fa, git reset --soft TAG1, or git reset --soft c14809fafb08b9e96ff2879999ba8c807d10fb07 would all do the same thing.