@leo3487 

When you say "repeat both bands" I hope you don't mean you created two wireless bridges between the C60 and the C50?

Making more than one connection in parallel between two routers can cause all sorts of problems. There should only be either one Ethernet cable connection or one wireless connection between routers. (ok, there is something called "link aggregation", but that's a feature seen mostly on high-end routers)

  @woozle Yes I meant mode Range Extender and repeat both 2.4 Ghz and 5 Ghz bands

As C50 allow it, in fact at quick setup after set up 2.4 Ghz ask you for 5 Ghz

Of course at main router, Archer C60 bands have different SSID

Paez-Internet

Paez-5G