RE605X, like all OneMesh technology from TP-Link, does not officially support a wired connection method. But "unofficially" the wired Backhaul has been running for months with no problems. So, in simple configurations, this trick is quite possible to try, but we must remember that with an increase in the number of extenders or, for example, some kind of broadcast traffic appears, a network storm can still bring down the entire network.
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