If you had a legitimate firmware file (e.g., DIR853_A3_FW_v1.0.3.bin ), a deep analysis would include:

Updating manually ensures you have the exact version required for your hardware revision. 1. Preparations

to your router's web interface (typically http://192.168.0.1 or http://dlinkrouter.local. ). Navigate to Management > Upgrade . Click Select File and choose the downloaded firmware.