... and once you name the TP-Link adapter using the Fritz!Box user interface, it'll be "unknown" to TP-Link software again. See above for why.

The 2.x.x versions are Qualcomm's core firmware. All the high profile brands are on 2.4 now, all the way down to their earliest 1200 series adapters - only TP-Link allows their users to be stuck at...

Plug them in side by side, factory reset them both using the button, then pair them (again using the button). Once the LEDs indicate they've paired and connected on PLC, deploy them to their...

Maybe if you ask a proper question, stating the hardware, the situation, and the symptoms ...

Yes. 1000 Mbit is what you get in perfect conditions; actual bandwidth decreases with the length, quality, and topology of your house wiring, and also with every single electrical device on the mains...

That's how it's supposed to work With devices added, link quality goes down a slight bit, but fast devices still communicate fast. Now proceed to add the others in.