Yeah, i just bricked and un-bricked my card too. The 8GB flash worked correctly but re-flash to my 4GB backup just corrupted the card somehow, seems either a corrupt backup or a problem with ATIFlash.
I used a CH341A programmer and a soic test clip.
Might be useful:
BIOS chip is a Gigadevice GD25Q41B -> Datasheet
It's located on the back: