In short, I switched to the TP-Link EAP225 and I'm _very_ happy at half the price. My old EAP245v1 was reliable, there were several spots in the house it couldn't reach. and it doesn't work with the new TP-Link control software, so I decided to update it. Since the EAP620 was on sale I bought two thinking I could upgrade to the new Omada SDN management software and get coverage everywhere. It worked fine for my laptops and phones. For anything that had a USB Wi-Fi adapter, like my media players and old desktops, it was a total failure. For some reason, I couldn't connect to Wi-Fi with these adapters unless it was in the same room. Even a wall was enough to block the signal over 10 feet away. Given that the EAP245 they replaced could work through walls five times as far as it could go, that was terrible. To get it working I'd have to install one in each room and since they were huge and didn't support mesh that would have been a huge undertaking. Instead, I bought two EAP 225v3s, plugged them in, and they "just worked" - for any device, anywhere in the house. And as a bonus, they support mesh if I ever need it, they're smaller, half the price, use less power, and since this EAP620 doesn't support 160MHz channels, they're the same speed. And as a bonus, they come with POE injectors. If you don't need WiFi in a very crowded area (several dozen clients) in a very small outdoor area, skip this option. Update the older one until you run out of WiFi 6E (new frequencies for more bandwidth) and figure out TP-Link firmware.
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