@Let-It-Snowman Indeed, there are usually several names/passwords involved in such a configuration: administrative (management) names/passwords, required to manage a device or access a site. Each...

@Born2Code When you write "I tried to configure it over WiFi close to the router and then connect it via MoCA, but that didn't seem to work either -- the iPhone app never could connect to it.", do...

@rret You are indeed limited to the changes allowed by the app.

@rret All settings are only accessible via the Deco app.

@Let-It-Snowman I assume that you are replicating on the Deco the config (PPPoE, etc...) you had on the Asus router. Is it possible that the modem, in transparency mode, expects the Deco to use the...

@Olequickdraw By "...", do you mean the menu "reboot, remove, support"? I suggesting taping the name of the Deco (or the pencil icon just to the right of the name). That should allow changing the...