@Jasperjt Hi, you may check if you can find the default Wi-Fi password on the rear cover, but not on the battery (Or you may try the last 8 digits of the IMEI number). Once connected to the Wi-Fi...

@epyblast Hi, please connect only the main router and the MR600 by cable via WAN, then connect a PC to the MR600 via LAN cable, test the speed again without any other extender or wireless clients...

@tokad Hi, MR200 V2 seems to be an old version, which was released years ago, may I know when did you purchase it? We cannot guarantee that there will be a new firmware for it to allow the band...

@balangaman We have reported the issue to the support engineers, they will likely reach out to you via email to continue to troubleshoot your issue. If they cannot fix it, they will guide you to...

@Souvik30 Have you referred to this setup guide to configure the QoS for the primary device? https://www.tp-link.com/support/faq/2693/ If the issue persists, can we have a screenshot about the QoS...

@EnzoConqueror What is the model of the main router? Does this C80 connect to that router wireless successfully via WDS? As far as I understand, the C80 connects to the main wireless via the virtual...