A firmware update might be the solution to fix the Linksys RE6700 setup problem. To manually update the firmware of your Linksys RE6700, follow the given steps. Firstly, make sure you have the latest firmware file downloaded from the official Linksys website. Save the file to your computer. Go to a web browser and then type "http://extender.linksys.com" in the address bar. Then click Enter to access the extender's web-based setup page. Click on "Administration" and then select "Firmware Upgrade." Click on "Choose File" and browse for the firmware file you downloaded in the first step. Then select the file and click "Open" to upload it. Go to "Start Upgrade" and then wait for the upgrade process to finish. Do not turn off the extender or close the web browser during the process. Once the upgrade is complete, the extender will reboot automatically. It is important to keep your router's firmware updated to ensure that it functions efficiently and securely. Manually updating the firmware of your Linksys RE6700 is a simple process that can be done in just a few steps. Just make sure to follow the instructions carefully and do not interrupt the upgrade process to avoid any potential issues.