Resetting default libraries on 50G

[BuckeyeEngineer]

I have a 50G and I accidentally saved the font changing utility "FNC.LIB" in the 0 spot. Apparently this is a default location and it caused my default fonts to be missing. I reinstalled the ROM thinking it would reinstall the default libraries, but it didn't. So how can I fix this issue, and how can I install the TI-89 font in the future? I'm really liking my 50G, but I don't understand how the entire library and program layout works. Thanks so much ahead of time for any insight.