Nevermind, sold the broken one and buy new M5. Problem solved.

Have tried disable UPnP, but problem still exist

Hi @Tony Yeah sure I have checked and know exactly where my devices connected to, that's why I can narrow the issue down to "Router A". Regarding UPnP, yes it's enabled right now. Will try disable it...

Quite similar issue with me. What about upload speed? Can you maxed it out? Try disable 5Ghz

Having strange issue with download speed, only download speed. I suspect something to do with the wireless? I have 2 pack M5 router at home, say "Router A" and "Router B", they are connected using...