Currently, you can use GPU-Z to dump your current card BIOS. After that, you'll have to drop back to a DOS environment, as WinFlash is not working with the 5850 or 5870 from my experience.

The new version of ATIFlash supports 5850 and 5870 flashing, and we've flashed several 5870 and a few 5850 cards so far. That's why I was asking for your MSI BIOS on the TPU boards.

Currently not working, however, is the ability to change settings using RBE and then properly flash the card. After flashing the modded RBE BIOS and rebooting, the drivers will simply BSOD or refuse to load. I can only assume this is caused by string errors in the RBE process.