Edimax BR-6478 AC V2 User Manual page 24

To connect to a hidden SSID, check the "Setup extender manually"
box and enter the details manually on the next page, as shown
below.
6.
Enter your existing wireless network's security key/password in the
"Security Key" field and click "Next" to continue.
Device SSID will be the SSID of your extender's Wi-Fi. If using
cross-band technology this will be 5GHz Wi-Fi for your router's
2.4GHz signal and vice versa.
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