So, another heads up on the NAND reading. For the DSi (Original), it's more sensitive than my mother when I forget to wish her a happy birthday. The DSi XL was much easier across the board, and can handle longer wires as well without having any problems. The DSi, however, took 13 adjustments, bringing the wire length down to barely enough to attach the SD reader and plug it in, at about 6mm per-wire, including my connectors. In contrast, I easily got away with over 10cm per wire with the XL, not including connectors, and I wasn't even trying for short wire lengths.
The DSi sucks for NAND R/W. If you're doing more than just a single-time HFW/title downgrading, get an XL.
Edit: And if it wasn't obvious, make sure you get three, or more, identical NAND reads before you start doing anything else.