Believe it or not 2 hours in the oven set at 180 - 200 deg C would reflow that enough to make the contacts good again. Did the same with an old 8800Ultra Superclocked graphics card once, worked a treat, but once a BGA is gone it's gone, end of really. The 8800 worked a treat for the next two months before it all went tits up again. To be honest it looks like the BGA on that is too far gone anyways - reflow may cause shorting across the balls if you got a proper liquid reflow on it.