Your kits have had issues with Dashboard stuff. You should not just "jump around" because there will be some files that will be missing. I know of a few people who Jumped and ended up with nice 15lb bricks.
Also if your dev has a side car, you could make a solderless solution to backup your nand. I checked the conectors and they have the things for the sidecar on them, basically its the same connectors so using old dvd cables hooked up to a parallel male port, you could easily dump your nand.