Place the _rpg directory and the _DS_MENU.DAT into the ROOT of your microSD card.
Everything that works on Wood R.P.G. should work on Wood R4. Wood R.P.G. has 99.8% compatibility. I won't say it is 100% because there could be the occasional glitch or bug. All future Anti-Piracy ROMs are not supported but could possibly be fixed on a 1:1 basis.
There is confirmation that this is working on the Original R4, the R4 SD clones, and the M3 Simply.
This is a port of Wood R.P.G. so this will use the same skins used on the R.P.G. as the GUI has not changed.
Wood R4 supports RAW format save files named ROM-NAME.nds.sav. You will need to rename your save files in order to make use of them.
Why use this over YSMENU?
This is a full firmware replacement. Expect all of the features of a modern firmware. Including Wii-connectivity, Cheats, Themes, Short-cuts, etc. Everything Wood R.P.G. does on the Acekard R.P.G. this firmware does on the R4 (except for on the fly A.P. patching for yet to be released ROMs). This firmware will continue to be updated, tweaked, fixed, optimized, etc. It is time to say goodbye to YASU's YSMENU by giving your R4 Wood!