@Gllambi What do you mean by "when I use it with other Wi-Fi modems it works"? Does another router gets you HBO Max (with the same modem), or changing the modem works? Is the issue happening across...

@OzOverlord What does it show in the app? Also, Is the Wi-Fi network not showing, or it's showing but you can't connect to it?

@Chris84 Set the E4 as a satellite, not main Deco. Turn off fast roaming & turn on beamforming in the app

@tprv Did you follow this: How to add an additional unit to your Deco network

@LP-De Not official, but connection preference, signal source selection, manually setting the MTU size etc.

@LP-De That's a device issue, not a router issue