Have just worked out that it helps to connect the old router to the pc via the WLAN port to effect the ip setting changes! They were saved immediately. Not made 100% clear in the video and other...

Thanks. I want to connect by Ethernet cable and tried the changes set out in the video, which is what I was doing anyway. The problem is that the router doesn’t save the change in its IP address...

I’m trying to set up my old TD W9980 router as a WAP linked to my new Fritz! Box router. Having changed the default gateway ip on the TD W9980 router to one that the new router can see, I click Save...