Today I decided to re-name my Deco mesh (a mixture of M5 and X55 Deco units) to something longer and more secure. Before renaming I had 90%+ WiFi strength throughout the house. Now it's almost zero!...

I have one Powerline adaptor TL-PA4030 and two Powerline extenders AV500, bought many years ago. I lost the instructions ages ago but now need to set them up with a new (not a TP-Link model - sorry!)...