@TP-Link Spelling mistakes, if you want few more here they are. In red. Thu Sep 24 03:39:06 2020 daemon.notice netifd: Network device 'eth1' link is up Thu Sep 24 03:39:06 2020 daemon.notice...

@Evava Is it possible you have Deco E4 instead of Deco M4?

@TP-Link I have similar but working environment, so here are details of it. Perhaps, that can help TP-Link engineers figure where the difference is. TV: Sony Bravia XBR49X830C Smartphone: Android 9...

Try changing SSID to something simple like MyNetwork and password to something simple like 123456. If that works, perhaps there were special symbol(s) in original SSID/password that Deco doesn't like.

@Vincern You might get better speed if you move Satellite Deco E4 to location where it gets stronger signal from Main Deco. Before you do that, this is the test you can run to see network speed your...

@Vincern One would rarely see perfect results when connected to Satellite Deco. It should be expected to see at least some bandwidth loss when using range extenders, and Deco behaves as range...