How to Atiflash on a Mac Pro without Windows or boot screen
Things you need: Mac Pro with PC graphics card installed Live Linux installation DVD USB dongle with Atiflash for Linux There is a version of Atiflash available for Linux (now renamed amdvbflash). The flash tool will not see the PCIe graphics cards if it is run on Linux in EFI mode. To force Linux on a Mac Pro to boot in legacy BIOS mode, start it from a live DVD. Before you start, make sure your Mac Pro reliably boots to your macOS partition without a need to use the boot screen. You can then install your new PC graphics card in the Mac Pro. There is no need to remove it at any point. Download and c opy the amdvbflash file to a folder on a USB flash drive or other removable media. Connect it to your Mac Pro. Boot to live Linux by pressing "C" at startup. Copy amdvbflash to the RAM disc by dragging your working folder to the Downloads folder. Open terminal and cd to ./Downloads/<your_folder>/ Make amdvbflash executable using the graphic interface or with t