@Wheels Have you checked the PM that I sent to you days ago? Give it a try, then confirm if you still have an issue, thanks.

@enginestarter I don't think so, when the Archer A7 working as an access point, it will not give you the option to configure Parental Controls. Check the difference between the router mode and access...

@mAGFuture Thanks Ivaylo for his suggestions. The web UI may be a slightly different from some other Archer models, you may find the WDS option under Advanced->Wireless->WDS as below:

@SuchFly What is the speed you can get if it is normal? BTW, what is the region version of your C5400, is it a US version or an EU version?

@tomyummmm Hi, thanks for getting back. It is actually not suggested implementing a third-party software into the Archer C6, which will void the warranty, and we will no longer provide the support...

@Cheolsoo The Archer_C50v4_KR_0.9.1_0.1_up_boot[190402-rel33022] is a customized version for the Korean market, there is no way to change the router language.