For the most secure and compatible version, always use the official regional support portals:
Connect your computer to one of the LAN ports on the DSL-2750U using an Ethernet cable. Open a web browser (Chrome, Edge, or Firefox). D-link Dsl-2750u V2 Firmware Me-1.30 Download
Look at the sticker on the bottom of your D-Link router. It must explicitly state or V1 (with V2 compatibility notes). Do not use this firmware if your sticker says T1, U1, or C1. 2. Verify Regional Code For the most secure and compatible version, always