There are PC5 maps already created by PC, and by others here.
Download map you want to your computer. Connect PC5 to computer through USB cable, transfer(upload) map from computer to PC5.
Ride like the wind.
Don't expect somebody to have created a map that matches every single detailed mod you've made to your bike though.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs