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The purpose of d0 is BIOS disable. If you pulled the trace up by accident or something like that, your Xbox wouldn't boot because it couldn't find a BIOS at all (eg. the Microsoft BIOS).
Since it CAN find a BIOS, you're in good shape, far as I can tell. Another modchip should work well.
Always, *ALWAYS* tape up solder points and the areas around them. (Actually, for that matter, since I'm a terrible solderer, I put tape 360 degrees around that d0 point just to help with the possibility of a solder bridge or splash). And tape on top - as you found out.
A Matrix should work, unless you've managed to really mess up the d0 solder point. One way to check is to use a multimeter and touch both the top d0 and bottom d0 and see if you have continuity. If you do, then the surfaces of both those points should be intact enough that a Matrix pogopin should work fine.
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