Here you are link to Automated Flash Utility for flashing HD2900PRO (both 512MB DDR3 and 1024MB DDR4). The utility is bootable on iso image. Just unpack the archive and burn the iso image using the "burn image" option on your burning software on CD/CD-RW/DVD/DVD-RW. Do not try to extract the content of the iso because everything is on it: atiflash 3.42, 2900PRO and XT BIOSes. After burning boot from the already burned CD/DVD (first boot device - CD-ROM) and choose the desired option from the menu. The utility doesn't work in Windows.
Download link: http://www.savefile.com/files/1171876
Download link: http://www.savefile.com/files/1171876