how change master to older commit without deleting current commit

[hamidasgarian]

i have this commits in my local and remote repository
A B C
and master points to c
i want to change master to B (or A) in my local and remote

after tried this commands:
git reset --hard
git push -f origin master

that commands change master to B but also delete c commit so i can't checkout to c in future. how can i do that without deleting any commit or history?
just change master's pointer to older commit id in local and remote
A B C
|
master
A B C
|
master