Manually ??? What do you mean ?
I think Nanometer mean instead of flashing new SPD (and edit timings) you could set those timings manually via BIOS.

Stelios, do you have backup of your original SPD? Can you POST and enter Windows with one stick of this 'dead' memory and another 'good' mem? If so, perhaps you could flash the dead memory to it's original SPD.

Also did you use option 'Fix Checksum' (or something, can't remember the exact words ) before saving new SPD?