@Alexandre. Yes, it worked! I have this equipment now for 3 years and did not realize it was not working correct. Much more stable internet and streaming! many thanks!!

@Alexandre. Hi, Should I install all 3 (starting with the oldest) or only the newest one? https://www.tp-link.com/nl/support/download/deco-m9-plus/v2/#Firmware

@Alexandre. thanks for the quick answer. For some reason, it cvannot find my 2nd M9 anymore but this is what I have as firmware: and this is the product code of both M9's: I already foun the...

All equipement will only connect to the main M9. It will never connectie to the M4 or M9 in other places.