To perform Netgear WNR3500L firmware, check out the steps to resolve the update. 1. Start by opening the web browser on your computer and visit the official Netgear website. 2. After that, download the latest firmware version of Netgear WNR3500L. 3. With the Ethernet cable, connect the router and computer. 4. Type in www.routerlogin.net and tap on Enter. 5. Enter the login credentials of the router and press enter. 6. From the Administrator tab, tap on Advanced. 7. Tap on the firmware update option.