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I have a spectrum router sitting right next to the M9+ that gives me about 250 Mbps while the M9+ gives just 60. It went down recently after about an year of using this.
Speed test on Deco app is over 400 Mbps
tested on the 5GHz 
wifi and getting about 60
Hi, I see that your firmware is quite old and please try to update to the latest firmware:
Deco M9 Plus(US)_V2_1.5.1_210126
How to update the firmware: How to Update the Firmware of Deco (method 3)
And did you have any wired laptop which could test the Ethernet speed from the main Deco as well?
@TP-Link So why is the app not able to update it. The app says my system is up-to-date 
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