Connect Router to Two Wireless Networks

[diegoandrade]

Hello guys,
I use an Asus AC68U router in bridge mode. I connect to a Wi-Fi network and stream to the computer via cable. I use two Wi-fi networks depending on the instability, always changing manually between one and the other. What I would like to know is if there is any Merlin firmware version or any other type of procedure I could do to leave the two networks pre-configured and even switch automatically depending on the network status.

Thanks in advance to everyone.