Usually, there is a dedicated firmware upgrade section within the router administration site.
It may be located under the Router Setup page, the "About This Router" page, or perhaps under a “Maintenance” or "Firmware Update" heading.
After you enter the IP address of your router in your browser's address bar, you will likely be prompted for the administrator name (typically “admin” or “administrator”) and the default administrator password.
These credentials can likely be obtained from your router manufacturer’s website or they might be located on a label on the bottom or back of your router, typically located near the serial number of the router.
Many routers use 192.168.1.1 as this address but it does vary.
Some routers may require that you first save the file to your computer and then select the firmware file via the administration console.Download the most recent factory firmware, software utilities, and documentation for your device. Connect the other end to one of the LAN ports on your router (preferably LAN port #1). After rebooting, wait another 5 minutes and run a “ping” command from your computer to see if the router responds.Once you’ve downloaded the latest factory firmware, login to the router administration panel and upgrade the firmware using the upload feature. Remember, these are not high-powered computers like your desktop.IMPORTANT NOTE: Don’t interrupt a firmware upgrade that is in progress or you could potentially damage (brick) your router.Try to avoid doing an upgrade during a lightning storm as firmware upgrades and power outages don’t mix well.However, if the manufacturer issues a major change, it could reset some (or all) of your settings.Therefore, its always a good idea to read the update notes from the manufacturer when downloading a newer version.This option is usually located within the “Administration” or “Configuration” section of the admin panel. Flash the router After you click “upload,” don’t do anything! When the upgrade is successful, three things may happen: If #3 happens, wait a several minutes and then navigate to the IP address of the router (192.168.1.1, or whatever your routers IP address is). They are low powered devices with slower processors.It may take a few minutes for the router to adjust. TIP #1: In most cases (notice I said “most”), the upgrade will not affect your settings.As bugs are found and corrected, updated firmware is released.Router manufacturers may also issue a firmware update to upgrade features such as outdated encryption modules or they might add entirely new security mechanisms that weren’t in previous versions of the firmware.