I modified the Microchip C18 firmware for the USB loader a while back to work with the 18F2550. I have attached it here with a simple PBP code example.
Comments are in the PBP code for LED & switch connections. I know it works. I'm using it. If you have problems check your connections.
I won't have time to offer tech support on using the USB loader, re-compile it for another clock speed, USB PIC, etc, etc, so enjoy, and hopefully you won't have any problems.
You might want to download the docs for Microchips USB demo board. This explains a lot about the loader & circuits required, and how the C18 USB loader firmware works.
If anyone wants the modified C18 USB loader files let me know. Note you will need the C18 "C" compiler if you want to make changes.
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