@Hadde Thanks for your requesting. Do you access the web UI with the global IP address or the DDNS locally or remotely? In other word, are you still connected to the Archer VR600v when you tried to...

@Nacho123 Below is the download link of the firmware for the Archer D9. https://www.tp-link.com/support/download/archer-d9/#Firmware May it help.

@Digital80 Please read the spec page there you can get some information. https://www.tp-link.com/support/download/td-w9970/ May it help.

@PyroGer101 Correct, you only need connect one cable from the main router to the base unit.

@WimPijn Deco M9 plus can build up the mesh network system both in router mode and AP mode; while there are some differences betweem them. You can read the below instruction....

@FrancInnov Below is the instruction to setup the access control on the Archer C50. https://www.tp-link.com/support/faq/1724/ After that, try to clear the browser cache and change another web browser...