@Memo2001 Check this thread. This could be due to the network protection against cross-site request forgery (CSRF) attacks - HTTP Referer Head Check feature enabled by default. Some TP-Link devices...

@chander123 Here's a link to download FW v1.0.16 for EU region. You can do a manual FW update. If your FW region is US (that's on your device bottom sticker) then try this link.

@martri This thread is the best source of information regarding REs Easymesh ethernet backhaul support.

@OMS_12 Check this thread regarding your issue (I saw you've already done that).

@tapo_user2022 OpenWRT may work for you if it's applicable for AX23 but it will void your warranty. Here are the routers that could do this job for you - ER605 in your case will suffice.

@AlexCoxie If you set the PX50 in AP mode like this (powerline backhaul instead of ethernet backhaul): and all the PX50 are on the same electrical circuit it should work - check this deployment guide...