The DSL-2750U C1 is more than just a modem; it is a combined ADSL2+ modem, 4-port Ethernet router, and 802.11n Wi-Fi access point. The firmware acts as its operating system.
: Look at the sticker on the bottom of the router for "H/W Ver: C1" . d-link dsl-2750u c1 firmware
Before attempting any upgrade, confirm your hardware version. The DSL-2750U C1 is more than just a
If your firmware filename contains ISK or VVT , it is ISP locked. You will need to use a "Recovery" image before you can flash generic firmware. it is a combined ADSL2+ modem