We have a Grandstream WiFi network. There are three APs spread though the house. Yesterday I did a firmware update on them. This morning our oldest iMac (2013) refused to use wireless at all despite showing it was connected. I hooked it up with an Ethernet cable and it was absolutely fine. Every other device in the house is fine on the WiFi. I can't find any obvious fault so I wondered if the firmware update might have done something that would prevent an older device from using it?
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