Hi everyone, i have galaxy s6, it had this firmware installed already when i bought it [ [ Login above or register to see download links. ] ]

and it was rooted(checked from root checker app on google play) and i tried to install this firmware [ [ Login above or register to see download links. ] ]
without un-rooting the phone....after installation it gave me an error saying "Device doesn't have DRK, please install DRK......"
then i restarted the phone and when im in download menu it says "sw rev check failed Device:5 Binary:1" now i'm not even able to install any firmware it fails through odin.....and the phone doesn't start either....
any ideas? i really need to fix it asap!
Thanks in advance.