I heard change DSL modulation type to ADSL2+ may improve upstream and downsteam. But if you use AP mode, it doesn't really matter. AP mode works OK now??

Good point!!! :o

If you move WR710N closer to your router, how about the speed? Try different channels. As I know, it would be half because it is in half-duplex mode...

No lights at all? Try a different power cord?

My WDR4300 has no similar issue. What kinds of wireless devices you tried? Can you update driver of those built-in wireless cards?

WAN IP is a public one on the root network? Since it is working as an AP, remote management settings won't work I think. Try the following method. 1. Open port 80 on the root network for C7's LAN IP....