Da vinci 1.1 plus open filament

Hi, i have a da vinci 1.1 plus printer i inherited from my dad it prints perfectly and love it compared to my old printer - i am having troubles finding the firmware with open fillament enabled so i can use any brand filament- is there anyone that would have the download link? or a guide how to do it? i have the xyzfirmware flash tool and have tried doing as instructed on the pdf manual but do not have password for .zip file