what is the IP address of your root router and the TL-WDR4300 now ? Do you know that your root router can support WDS or not ?

You are using the TL-WA7510N, not TL-WA901ND, right ?

A USB webcam ? Maybe the TL-WR1043ND cannot handle it properly. Does it support :confused: if you do not use the webcam, will the sys led light off ?

If your windows 7 can share the storage, I think the problem is not in the computer, but in the phone, and maybe between your android phone and the router and in the router...How did you login to the...

Just normal ethernet cable...external antenna should work...

You had better check the compatibility list first: http://www.tp-link.com/en/support/3g-comp-list/?model=TL-MR3020