So I've set up deco S4 and it's brilliant (Router now in modem mode) but... cannot connect my Humax box to it nor my Sony TV. Can see the networks but won't connect. Interestingly the only way I could connect my NOWTV box was through the guest WiFi access, failed on the main network (and yes I checked the spelling).

When connecting I turned off the 5GHz aspects on both main and guest, after trying with it switched on. The fast roaming is also disabled.

any ideas please?