There is beta firmware available that has improved things for many users of these adaptors. See...

There are options for separate SSIDs at least on the 8000 series WiFi and both work at the same time. I have not tried setting them the same, but it should work.

I use the 9000 series with an 8000 series WiFi unit. Finally using the beta code from TP-Link that I uploaded elsewhere on here it has been stable for a couple of months now. I have not yet tested...

If it stopped working after 3 years and nothing has changed then it's most likely faulty. Check it with both units plugged into a dual socket next to each other (not via an extension lead) to...

Yes it should work as a dumb switch.

Worked for me (via the recovery utility) on bricked 1.0 hardware. See the thread with the utility on....