Do you mean you failed in step 4 in faq: http://www.tp-link.com/en/faq-821.html

Good share.

I used to upgrade the firmware through camera‘s Web UI on my Windows, it's more steady. You can download the firmware on http://www.tp-link.com/en/download/NC450.html#Firmware

there is utility for Mac. http://www.tp-link.com/en/download/TL-WPA4530-KIT.html#Utility you can access with tplinkplc.net http://www.tp-link.com/en/faq-1087.html

Is there an Internet IP address? Change the DNS to 8.8.8.8 if yes. Otherwise, reset the router; create a profile and manually fill in parameters given by carrier. Of course, make sure your sim card...

try different web browsers.