galaxy s5 appears to be blank in file explorer after try to downgrade the rom back to stock

[AC Question]

i did a hard reset on my galaxy s5 because I new my google account info so no worries. Needless to say i don't recall ever making a samsung account and I did buy the phone used but i have used it for the past year. After the hard reset and being stuck at the samsung account screen I tried to flash the firmware back to stock with odin with no success. When you put the phone into recovery mode it says Android 6.0

 

[Tim1954]

If you haven't backed anything up, you are fresh out of luck I'm afraid...