Hey David,

Well I was thinking of just trying the 10mhz part first, and trying to make a 10mhz bootloader hex. Let me modify it for you, and send it your way. That will be the first step. If we can get that going, we can try to do something similar to what was done on the 18F4550, only, yes, we would have to modify the config settings to match the 18f4520.

Walter