Step 1: Open your web browser and enter http://dlinkrouter or http://dlinkrouter.local into the address bar.

Step 2: At the login page, enter the Admin password. If you have not changed the administrator password, leave the field blank. Click Log In.

Step 3: Move the cursor to the Management tab and then click Upgrade.

Step 4: Click the Check For New Firmware button. If the DIR-510L finds new firmware, then the firmware will be upgraded automatically.
Warning: No not turn off your router during the firmware upgrade process. It is also recommended that you only conduct a firmware upgrade when the device is connected to the AC power adapter.