@Jaifa Get the latest FW release from here. Just make sure that your C6 is with an (EU) FW region:

@Joseph-TP I understand these concerns, but the OP already have been in possession of those two devices - that's why I've advised on this undocumented option.

@Eors71 Depending on the service you use from your iSP, you may have the opotubity to get a third-party router (even a TP-Link branded). Using this third -party router you'd have the opportunity to...

@Eors71 In general, the steps should be: Login the router, configure your TP-Link ID in the router WebGUI. Save the settings and Logout. On the next login screen select: Login with your newly...

@Eors71 What exactly you're trying to achieve ? To configure a TP-Link ID within the router's WebGUI, which you can use to login into the router ? Or the router can't check for an updated firmware...

@Trmorgal Have you tried to use the WPS method to connect the RE to your router - details. Here's a more detailed guide on the WPS method if you experiencing any difficulties.