Linksys Router Showing Red Light? - Here's the Fix
The Linksys router red light indicates you have connected the modem to the wrong port. Thus, you must connect the router and the modem from the correct port.
You must plug the Ethernet cable into the Ethernet port, the red light should turn solid blue. However, if the issue persists, you can try power cycling the router to fix the issue. You can also reset the router to fix all glitches.

https://linksysrouter.net/link....sys-router-red-light

Quick and Easy Guide for Linksys RE6300 Setup.

For the Linksys RE6300 setup, you can use two methods for a proper setup. The first method is through the web interface and the other is using the WPS button.
For the former method, you require the default IP address, username, and password. To set it up using the WPS button, you must ensure your WiFi host has this feature. You can set up the extender within a few minutes, using this method.

https://httpextenderlinksys.co....m/linksys-re6300-set