I'm having trouble installing this on my R4 SDHC. I have completed the following steps:
1. Downloaded latest WAIO file from OP.
2. Dragged _rpg folder to ROOT of SD Card.
3. Dragged the WAIO.nds file in to ROOT of SD Card.
4. Dragged WoodR4.nds and WoodR4sdhc.nds file to ROOT of SD Card.
NOTE...