I'm having the same issue mine says unknown card it worked previously with the patch TWL but so isn't working without the patch TWL and AuReiNand.unknown cart? Sounds like a hardware problem. Perhaps bricked/dead cart? It's supposed to have a unique id followed by "TWL". Even original R4 has a valid id in devmenu. Unknown Cart means it failed to init correctly and could not read the rom header.
EDIT: I was able to get it to come up as 4153d41 TWL Card in the dev menu but so far still no boot. It shows up as the blank card in the normal slot but both the Wood r4 launcher and the regular card go to the black screen with text when I try to use them. It worked previously and the card works on my DS Lite. I fixed this little spring in the microSD Card slot so hopefully it works better now.
EDIT2: I'm apparently retarded and missed this step on the AuReiNand OP "To enable AGB_FIRM and TWL_FIRM patching, just also copy the firmware_agb.bin and firmware_twl.bin files for your console from the FIRMs.7z." It works now.
Last edited by Link_of_Hyrule,