"this issue"... whatever that is... Neither you nor
@Quan actually say exactly what problems are. Or are you expecting the rest of us to be mind-readers?
In another thread, you said you had performed a "dirty upgrade" to Merlin's fw, and Sonos could not be found, so you rolled back. Have you considered it might just be the fact that you didn't do a factory reset, as instructed? It is
not ASUS firmware, it is
based on it and includes enhanced functionality, so you can't expect the config-files from one to work flawlessly with the other, especially when explicitly instructed to do a hard-reset when switching between the two.
Don't blame the fw if you can't be bothered to follow the instructions.
Install the firmware, do a hard-reset as instructed, and reconfigure (i.e. don't just restore the saved config-file from the ASUS-firmware).
Only then should you report back if you are having issues. And if you are expecting anyone to help, post some detailed information.