General D-Link firmware sets can occasionally be found on the Official D-Link Firmware SourceForge . Critical Pre-Installation Checks
For technical users, the D-Link FTP Repository contains archived firmware versions categorized by hardware revision (H/W Ver.). dsl-2740u firmware version me 1.04 download
Installing the wrong firmware can permanently "brick" your router. Before downloading, verify your specific hardware version: General D-Link firmware sets can occasionally be found