I can not change he BAND, and on the Master "TDD Synchronization Status - LOCKED" and on Slave "TDD Synchronization Status - Timing System Not Connected"

This device is locked to 5Mhz because customer only have license for 5Mhz.

On Master side shows "TDD Synchronization Status - LOCKED" because you a have GPS device connected to the Master Side, and on Slave side it shows "Timing System Not Connected" because you may not have a GPS device connected.