A: The radio’s band split is locked in the factory. You need the "modification" software (CS-F4000 with band expansion key) – not recommended for legal use.
Always save a backup of this original file before making changes. Edit Settings Memory Channels icom icf4003 programming software work
Assign the side buttons (P0, P1, P2, P3) to functions: Mastering the Icom IC-F4003: A Guide to Programming
This explains why editing raw hex dumps is nearly impossible without the software. icom icf4003 programming software work
Launch the CS-F3002/F4002/F4003 software on your PC.