I have the same issue as above but my serial is LU9202...so is mine one of the wiis that can only be softmodded? HELP??!!
Dr. House @ Wiihacks
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All Wiis can be softmodded. The issue of D3-2/D4 will prevent backups via optical (DVD drive) from playing, but doesn't curtail USB HD for this function. Or WODE. Or Sundisk. Or WiiKey Fusion (SD cards).
I ended up solving most of my issues by softmodding in addition to having the drivekey chip. Between the two, I haven't had an issue with any game since. Everything else listed throughout this site is true in regards to burning speeds, media type, etc. I use Verbatim discs at 4x speed to burn. I softmodded my Wii via the process of downgrading my Wii from 4.3 back to 4.1. Between the two mods, I never get prompted to upgrade via disc.