Being a new ham I have a chance to pick up this radio for $50 there is one problem that is apparent and that is the UHF side is 480 - 512MHz can this be reprogrammed?
The F520 is a VHF 25W radio and the F620 is a UHF 25W radio.
They are seperate radios and NOT a single dual band radio.
This is a commercial quality radio and to answer your question
NO they are what they are and you can not change the frequency
range.