Well... It can be done just not legally. You can mess with radio perameters. Now I don't know about the Hytera, but the Tytera there is even a forum on here where the user discusses " parameter tweaking". Changing Output watts, operating with some efficiency into T-Band frequencies in DMR mode. Granted when you play with radio settings like this the radio gets " wonky" and may not work properly, but to say it can't be done is not true cause you can if you really want to take the time and effort to do so. The legality on it is shades of gray, but I'm sure illegal ( even though you technically can under FCC guidelines for amateur radio use) because of copywrite and patent laws.