@Marvin_S yes, no option to upgrade the 3x routers (they're V1.20), only the 4th one (V1.0) can be upgraded. Will have to wait for TP Link to publish the 1.3.10 upgrade for V1.20 for EU...

@Marvin_S sorry for the late reply. I restarted the router, here are the requested screenshots: It says 1000Mbps Full Duplex for port #3 but it initiates Wi-Fi backhaul with very low signal (yes, it...

@terziyski I'm sorry I'll explain better: they removed the "Upgrade firmware" option where you upload your own downloaded firmware file. Instead they replaced it with "Upgrade to latest available...

@terziyski by not allowing me I mean they are literally not allowing me (the firmwares they are using on the leased routers are slightly modified and the Update firmware option is not at the complete...

@terziyski ugh, unfortunately the "Archer AX10(EU)_V1.20_1.3.10 Build 20240130" version is not available yet in my region (Romania), only in the Worldwide/English link you gave me, and I cannot use...

@Marvin_S right now router #4 is connected to LAN port #3 on main router "And please share the screenshot to show the link speed of corresponding Ethernet port on web UI page of main router" How...