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You didn’t mention which model of Linksys router you are using. It may update automatically. To find the specific method to manually update firmware for your router, go to the Linksys support website, then find your model of router. Click the “FAQs” tab near the top of the page for that router, which will, obviously, take you to FAQs. Once there look for the “Advanced Configuration and Troubleshooting” heading, and you should see a topic “How to manually update firmware…”. Click that and it will take you to an article that guides you through the exact process for your router. In general there are two steps; You will need to (1) download the latest firmware, then (2) upload it to your router through the local router interface or Linksys Smart WiFi account.