This is often the case for amateur radio equipment as well - transceivers are configured not to transmit outside the licensed amateur bands, but there is often

This is often the case for amateur radio equipment as well - transceivers are configured not to transmit outside the licensed amateur bands, but there is often a simple modification (cut a PCB trace, remove a component, etc) that happens to remove those limitations. These are often called "MARS mods", since the Military Auxiliary Radio System uses HF frequencies that are outside the amateur allocation.