pls help to find orjinal bios ati5870 1 gb for macpro

hi i have atihd5870 graphic card for mac pro. but my firend flash its bios 😟 i wanna flash its bios to orjinal becouse card doesnt work on mac pro. pls help me to find ati5870's orjinal bios. its bios number p/n102 c0780200 .