@Kevin_Z I have had replies from TPLInk by email. But they all seemed to be focussed on the main deco which is wired into my router, not the mesh itself. The response I got was " If what your getting...

@PieroSimonassi I have 3 M5s and 1 E4R. My download speed had dropped to < 1 MBPS following the upgrade to 1.4 and after wasting most of the day rebuilding the network, individually installing...