Quick question, downgrade nougat to marshmallow without wipe?

SM-G935F, I want to downgrade from nougat to marshmallow.

Am I able to do this without needing to wipe the phone?

I am planning to flash firmware via Odin without wiping it.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 1
crwdns2934285:0crwdne2934285:0