printer wont connect

This will work for any older 2.4GHz device.  Worked for our cameras and lights and printers.  In "Network"  you can add another network by pressing the magenta +, give the new network a unique name, change the  frequency  to 2.4 only and the protocol to WPA2, leave the rest as is.  Let the router update then search on your device for the new 2.4 network.