Just found it via the US download site. I'll give it a go, thx

@jthcomputers Thanks for coming back to me on this but I can only see version 1.5.3 on the download page (Download for Deco M5 | TP-Link United Kingdom)

Since updating the firmware on my Deco M5 system in recent weeks, the internet access speed has slowed considerably across my house, individual deco's on the system (9 in total) are periodically...