@KarelWH Nope, RE605X can only join the Onemesh network via wireless, this is also mentioned in the article that I shared with you: Several questions about the OneMesh™ and Mesh

@Roffee We are expecting the new firmware for it as well. You will need to contact the local tech support if you want to replace the router.

@JeanRodrigues We are expecting the new firmware for it as well. You will need to contact the local tech support if you want to replace the router, while as for the warranty policy, I'm afraid the...

@echa You can try to switch the AX1800 to AP mode as per this guide, then set up a DNS server on it to check if it can work as requested: How to configure the TP-Link wireless router as Access Point?...

@FGARS2 Great. We would also guess the previous speed drop may be caused by the interference between the networks now. We could run on WPA2/WPA3-Personal, and keep monitoring the performance.

@Hmdualtaae1 The WR841N v8 doesn't support Tether, you can verify it from the below Tether Compatibility List: Tether Compatibility List