So about a few months ago I tried that custom firmware for the R4 called YSmenu or something instead of the official firmware my R4 used to use. I think I deleted some of the files that were required to use the custom firmware and I'm not sure if it runs properly. I just checked my R4 inside the DS and it seems like it still has the custom firmware in it with only "_system_", "_DS_MENU" dat file, and "_DS_MENU" system file. I don't really like the custom firmware to be quite honest, because it has this ugly white and gray skin and I also felt more comfortable with the official R4 firmware. If I'm still using custom, how can I get the official firmware back? Thanks if anyone can help.