So I was attempting to get the DLC on GH:WT working properly from the SD card, and I tried a few different cIOS choices to see which worked best. I used Configurable USB Loader (v55) for my testing. Here are my results: 249rev17 - neither the DLC nor the microphone work (IIRC - I might be remembering this one wrongly) 249rev19 (base 57) - DLC works perfectly on SD or NAND, but the microphone is not detected 223rev5 (base 37) - freezes occur when trying to load DLC or the music store 223rev4 (merged bases 38 + 37) - microphone works, but DLC on an SD card gives the "Out of Date" error and some numbered error when transferring is attempted 224rev5 (base 57) - freezes occur on the music store, the microphone is not detected 222rev5 (base 38) - microphone works, but SD DLC gives the usual transferring and playing errors (ADDED) 250rev19 (base 37) - everything works perfectly, thanks for the suggestion! (Old) Conclusions: - If you want to play DLC from an SD card, use 249rev19 (57) -- but the microphone won't work - If you want to use the microphone, use 223rev4 (38+37) -- but the DLC won't work from an SD card - If you want both, use the original or a backup disc. (New) Conclusion: Use Waninkoko's rev19 (base 37) and everything works!