how to change the device name by ble_app

hi ... i want to change the device name by using our customized nrf toolbox , user will entry the name of device , so that particular name should with the previous name (nRF5X) ..How to do that ?

 i tried by copying the received data to device name (strcpy (device_name , user_name) , the name is not changing . i have seen multiple threads, none of them work out

suggest me 

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