@MedMez I have no experience with ubiquity networking gear, but maybe @Philbert can lend you a hand with that.

@ZestforLife It is my understanding that anything connected to Deco Guest Network will not be placed in offline devices list when it disconnects. Check that: enable Guest Network in Deco app,...

@AndrasN You appear to be technically savvy, so here is another option for you to try: firmware recovery, with the latest firmware file from the TP-Link Support page. How to use firmware recovery if...

@BobInIdaho I would point at two things: 1. "50 feet away" is at the end of recommended distance for Satellite Deco. See Q2 in General question about the Wi-Fi range of Deco. In simple terms, it...

Alexandre1969 wrote Guys, just to conclude. I returned the Deco M4 and exchanged it for M5. But even with three M5 it didn't work well. I had to add one more, then it worked. Still, the internet on...

@PotatoWiz Let's start with basic analysis. 1. Have you connected both Deco M4 with Ethernet cable to the Archer C6 router? I mean, each of them connected to Archer, right? This is how I read your...