I have been having real trouble to get my Deco to work on the most optimized network. I have 2 units of M9 Plus and 2 M5, with the M9 Plus acting as the main deco. The problem is all my satellite Decos are all connected to this main deco even though it is the weakest and farthest connection instead of connected to each others resulting in poor network speed. 
 

i know that TP Link had been saying that a firmware will be released to fix this since 2019...has anyone managed to get this firmware that allows you to manually select the signal source you would like your deco to connect from?