Sorry for the newbie question but will loading original NTSC discs and allowing them to update brick my NTSC wii?
You should not update via disc as you will wipe any and all mods from your system that you have already done. The 4.2 update is especially tricky [and what you will update too if you use the big N's official online updater]. I've never had someone brick from one of these update, but I have heard some horror stories [most notibly from the 4.2 update (even on virgin Wiis)]
No games currently update to 4.2 using a Disc check I thought. But that might've changed. Like New super mario bros which just came out only requires 4.1 and it has that Disc check on it. It checks for firmware 4.2.
3.1-4.1 Softmod Tutorial (Works on all wii's!)
Wii 4.1u | Bootmii (IOS) | Priiloader 0.2 (Rev 32) | HBC 1.0.6 | Neogamma R8 Beta 7 and Neogamma RC3* | USB Loader GX REV 919
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first of all load the original game through your backup loader once and play the game. The next time it should not display update available in the Nintendo Disc channel. As you have already played the game the system should assume that you have updated as well.