Hi Robert,

CONFIG PLLDIV = 5 is a "config word" option. This sets the PLL prescaler to
divide the 20MHz primary osc input by 5. This is required when using a 20MHz
primary osc because the input to the 96MHz PLL must always be 4MHz.

DEFINE OSC 20 is different. This is used internally by PBP to adjust timing of
PBP library routines to the 20MHz primary oscillator.

bioeng-mostafa,

If you don't have the 18F4550 device header files, then you need to update
to the latest version of PBP. Version 2.46 introduced support for the 18F4550
series.

Just having someone email you device header files does not guarantee you'll
be able to use the new device. There are more to some PBP updates than
additional device specific header files.