I wouldn't even try removing the nand unless you have access to a hot air reflow station. I got some knockoff one on ebay for like $250 (it says "Quakko" instead of "Hakko", lol).
I'm just saying it is a viable method to read the flash if nothing else works, I didn't say it was easy. It's on a similar level of difficulty as doing a 128mb ram upgrade on XB1, though less pins
Another word of advice: practice removing the nand from your donor/parts/rrod board before removing it from your good board. The board doesn't need to power up (rrod, missing parts, etc is fine), it just needs to get standby power, have a southbridge, and a nand. Don't be too afraid if you lift a pad, most of the ones that lift do so because they aren't connected to anything anyways.