AD9361 Change BW

Dear sir:

I want to change different Bandwidth (like LTE 5MHz to LTE 10MHz) in the running time, the procedure may be

Tx state ->reset->change BW ->Tx state

If we follow the procedure as above, should we re-configure all register after reset?

Another procedure is :

Tx state ->power down->power on->change BW ->Tx state

How should we configure register to implement the above procedure?

Thanks a lot~