Do a pinhole reset to factory settings his way.
With the Hub "on" push in the pin on the back/side/bottom of the Hub with the end of a paperclip until you feel it at the “stop point” and hold for a "timed" 60 seconds do NOT restart the Hub after that. Your passwords/passphrase for both the Hub settings and Wifi networks should revert to the two printed on the Hub sticker on its base/side/card - use the right one for your purpose.
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John
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My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.