Same problem here, trying to get Batocera to work. He can see 9 other networks in the area, the most distant being 6 houses away. But I can't see any of mine (I have 3, one 2.4GHz to 5GHz and one extender from all WPA2) about 8 feet away. Oddly, the other day he saw 5 GHz, but he was only there for about an hour so he wouldn't connect to it. Nothing at all happens when I put it on manually.

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Wifi connectivity was working fine when I flashed with batocera-5.26-rpi4-20200417

Then within a few days it informed me that there was an update, I used the update in the system menu.

After rebooting it could not connect to my Wifi.

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no special characters in SSID name.