PV4 Main Control Board, Originally was Single Configuration, Now I Want to Switch to Dual Configuration

Hello,
The services will be interrupted. If it can be interrupted for about 10 minutes, change the data to the dual-master configuration and directly reload the data of the two boards. If it cannot be interrupted for 10 minutes, change the data to the dual-master configuration and load the data. To the newly added PV4 board, do the active / standby switching operation (make sure that the short wires on the backs of the two boards are connected, otherwise the switching service is interrupted), add the new PV4 to become the active, and then load the data to the original active PV4 board. The interruption time is about 1 minute, but there is a risk of switching failure.
Thanks