Messed up my galaxy s6 really really bad please help!!!

I realize i'm stupid af but here's what happened: I was trying to flash a custom rom to my SM-G920F galaxy s6 and accidentally uninstalled my OS. This morning I attempted to flash G920FXXU2POGN to my galaxy 6, I have no idea what the origina software was. Everything was going fine until the last minute when hidden.img appeared in the odin log and the flash failed. My device no reads: An error has occurred while updating the device software. Use the emergency recovery function in the Smart Switch PC software. However, neither smart switch of kies 3.0 support my device!! My device is still bootable into download mode. Please please please help. I've only had this thing for a day and I've already broken it