You can see this FAQ: http://www.tplink.com/en/faq-250.html. At the beginning the important thing is to set a static IP for yor computer.

After remote the VLANs, could everything be stable now? The VLAN setting like this: http://www.tp-link.com/en/faq-418.html. I can't make it clear for the process with the short typewriting. If you...

If you check Main router and everything is fine, then you could check whether the Access Point connect to the Main router wirelessly? Make sure you can ping from the AP to the router. The setting are...

Maybe the topology isn't right. Could you tell clear about it? And tell clear about the model:x01ND? There are maybe wrong setting with the ap or any equipment before it. You also need to tell...

I also met the thing, and it maybe set a fix time after it is produced. It can't change and it will come back to 00:00:00 after you reboot it.