Before updating, go to MAINTENANCE > System Settings and export your current configuration so you can restore it if the update resets your settings.
Updating from a factory firmware (e.g., version 1.00) to the latest is a quantum leap. Here’s what you gain. D-link Dsl-2750u V2 Latest Firmware Update
Visit the D-Link Support website or the D-Link FTP server to find the latest firmware for your specific hardware version (V2). Download the .zip or .bin file to your computer. Before updating, go to MAINTENANCE > System Settings