I thought I had it, but ended up messing up the code in the PIC. I
tried to reload it with a copy of the code I read from the PIC before I
did anything, but now it is not working at all.

I erased it and loaded the bootloader.hex file that came in the zipfile
from Byonics, but it doesn't work either.

I was using a PG2c programmer and ICprog software to program it.

Any suggestions what I may be doing wrong?