I've just purchased a TP-Link AC750 (TL-WR902AC). I want it to work in client mode to connect a Humax TV recorder that needs a wired connection to the internet without a 10 metre wire from my router.

I switched the thing to AP/Rng Ext/Client mode, plugged it in, waited for the lights and then went to my computer to find the network but, whilst he TP network appears in my network list, once I click to switch to it, it says 'No Internet'.

I then tried connecting the TP AC750 to my main router with an ethernet wire. This allowed me to access the network on my computer and go through setup via tplinkwifi.net, but at the end of the process, the wifi button on the TP AC750 flashes constantly and it can't connect.

Is there something obvious I'm doing wrong here? Am I missing out a vital stage?

Thanks in advance for any help.