I'm gonna do the mod on a 4.3(J) console soon. Using wii.guide and letterbomb, you plug in your firmware including region and you get a packet tailored for the specific region. I see more recommendations here for using ModMii, but from what I have seen trying to prep for this, ModMii doesn't ask for region, only FW version. (?correct?) I have a (U) console I hacked years ago using Smash, before these guides existed.