have you tried these steps ?
Place the range extender midway between your router and the area without Wi-Fi and connect the extender to a power source and wait for the light on top of the extender to turn solid. Be sure you have at least 50% of your router’s Wi-Fi signal at that point on the device you will use for setup.
NOTE: For initial setup, you may need to set it up closer to the router. For example, same room just for setup and once the extender is configured, you can then move it to the desired location.
On a computer, smartphone or tablet, connect to the Wi-Fi network name of the extender called Linksys Extender Setup. This is the default wireless name of the extender.
Open a web browser on your computer, smartphone or tablet and access the RE3000W v2’s web-based setup page by entering “http://extender.linksys.com
” or “192.168.1.1” in the Address
Once the Linksys Wireless Range Extender screen appears, click Start
On the License Agreement screen, click I agree.
It will now search for available wireless networks. Select your wireless network name or SSID.
NOTE: If it prompts that your range extender is placed too close to your router, you can either click Connect anyway to continue or click Find better location to find the right spot between the router and the area to which you want to extend your network.
Enter the password of your wireless network in the blank field. Then, click Next to connect to your network.
After successfully connecting to your router’s wireless network, you will see a confirmation message saying, Your extender is now configured