I have Powerline AV500 2 port passthrough powerline adaptor (TL-PA4020P) and a TL-WAP4220 (powerline + wifi). I bought them in 2016 in case that helps to identify the version, which I can't find.
It has been working well for a long time. Today I addded another powerline adaptor my network and it worked fine. I confess it's a Netgear someone gave me.
But now my initial setup doesn't work. I've tried resetting the WAP4220, plugging, unplugging, different durations of pressing the pairing button , etc. I reset both units - the PL-4020P by holding down the pair button for a long time, and the other using a paperclip in the reset hole. No matter what I try, i can't get it to work, but ti seems very unlikely to me that just setting up the Netgear adaptor fried my devices.
Anyway, what should I do? Is there a physical way I can reset the PA4020P? Anything else to try? I don't have a windows machine - just osx and linux.