Holy shit. This was quite the process and really tested my patients. First off I installed all 4 chips at once since I didn't think Xblast could be flashed to the tsop or that it wasn't a good idea. I know better for next time. Took me about 2 hours to get all the chips installed and I thought my soldering looked really good. No bridges, but all this xbox would do is frag. After fucking with it for about 4 hours I decided I had enough and put it away thinking the box was dead. This morning I decided to have another go at it, went back over my soldering and once again thought it looked really good but the damn machine still wouldn't boot. Now, I'm really frustrated. I take out the solder braid and start wicking off the solder in attempt to remove the chips. I notice that a couple of pins are slightly bent and might be touching other pads. I proceed to straighten them out, partially lifting a pad in the process. Once I get all of that done, I'm thinking there is no way this thing is going to start now. Well it surprised the shit out of me, it booted and all 4 ram chips passed. Maybe today is the day I should go buy a lottery ticket cause I feel pretty damn lucky this actually worked.
If I do it again I'll be putting xblast on the tsop.