When the case is removed it should look like the picture.i highly suggest that you take off the metal case it sits in so that you can access the bottom of the motherboard. If there is still an error dump one more time and compare.
Hacked xbox updating dashboard
to check what mother board you have to turn the 360 around and look where you plug in the power cable, then use the first picture to find out witch one looks like yours and what motherboard you are now ready to build a nand cable and dump your nand note: no xenon or corona motherboards are hack-able yet and i've been told that zephyr xbox's have a very low success rate. Depending on the address the block is at it might be okay to continue but I would STRONGLY advise against it because if you don't get a good dump then if something goes wrong (which is very possible with non matching nands, if the error in the wrong sector) you don't have a stock nand to flash back and lose your xbox.
Not sure why you mention "flux" at the end, unless you are using the wrong type of solder. If however you want to continue then look into using J-runner for making the ECC image.
On Friday, however, it claimed the cyber attacks had stopped.
"Confirming again that we are no longer attacking PSN or XBL, nor are any members," Tweeted a self-identified member with the handle "Lizard Mafia." Play Station scrambled to resolve the problems late Friday, as Sony tried to rebound from a devastating earlier hack related to its movie, "The Interview," which debuted on Thursday.
Soldering irons can be very hot and cause burns, as well as possibly break your Xbox 360.