try another computer or browser? never heard of this. you can contact tp-link support for suggestion.

WileCoyote wrote The released FW is from last year and there were two releases before that - the router will not accept any of them. I suspect that since it is on 0.9 version - some thing is wrong...

it is sold in China only so i don't think there will be an english manual or firmware for it. Have you contacted their support team? or ask your Chinese friend to help you?

you can disable wps under advanced--wireless--advance wireless--disable wps For 64-bit encryption - You can enter 10 hexadecimal digits (any combination of 0-9, a-f, A-F, and null key is not...

i don't think C59 support igmp snooping. it is only igmp proxy.

move the extender closer to your router. contact tplink support to debug if same problem