Navigate to > Upgrade (the exact path may vary slightly depending on your current version).
D-Link maintains regional support sites. Depending on where you purchased your device, you should visit the corresponding official portal:
Once you have downloaded the correct .bin or .img file, follow these steps: 1. Preparation
Before downloading any files, you identify your hardware version (usually labeled as H/W Ver: Ax, Bx, or Cx). Installing firmware meant for "Version A" on a "Version B" device can "brick" your router, rendering it unusable.