by accident i was using the "atiflash" from the AtiWinFlash folder (that's the file that wouldn't work in DOS mode), so i google "atiflash 4.17" and downloaded it. It's gonna be a .zip file with only one file inside named "atiflash-4.17". Rename it to just "atiflash" and use Rufus to create a bootable USB. Make sure it's FAT32 & FreeDOS. Then simply drag your .bios file & the atiflash file you just renamed over to the USB (they go at the root of your USB). Go into your bios and boot from your USB stick and when in tap any key until you reach a C:\ part. Type "dir" it'll show all your files on the USB. then type "atiflash" then atiflash -f -p 0 [BIOS_filename].rom and it should take literally less than 5-10 seconds to flash the old bios back onto your AMD GPU.