I have an ancient Netgear access point in my spares cupboard, and I needed an additional access point, so I got it out and tried to configure it.
The problem was, the Netgear box was so old, that the https encryption methods that it could use, are all so old that current browsers don't use them. And it refused to be accessed via http.
I tried Firefox and Chrome. No luck.
So I had a bit of a think. What I needed was an old browser. So, using Google, I found Firefox 38 and installed that; installation was easy, and didn't mess up my current Firefox. And that worked - I was able to access and configure the Netgear, and it is now sitting quietly in an area that gives wifi coverage to a part of the house that was previously uncovered.
It turned out, I needn't have done it. I also have a Buffalo wifi access point (I have a story about that, see below) which still works, and I bought another TP-Link on eBay for £12,a nd I also have a wifi repeater that will also work as an access point. And the Siemens wifi AP that I thought had failed, just needed reconfiguring. An embarrassment of riches.
So, the story about the Buffalo.
A long time ago, I had my leased-line access (2 megabits) terminating in the house, and most of the servers in the garage, which was a separate building several yards away. In order to join the garage servers to the in-house servers, I used two Buffalo wifi APs as a bridge, so that the two groups appeared as a single network, and I had a speed of 54 mbits between the two groups.
Later on, I strung a cat 5 overhead between the two buildings. Maybe I should have done that in the first place.