is a highly integrated combo gateway designed to provide up to 24 Mbps downstream via ADSL2+ and up to 300 Mbps local Wi-Fi over the 2.4 GHz spectrum. Knowing your specific internal components helps when dealing with custom parameters: Component / Standard Specification & Capability ADSL, ADSL2, ADSL2+ (ITU G.992.5 Annex A/L/M) Wi-Fi Performance 802.11n (Wi-Fi 4) up to 300 Mbps via dual MIMO antennas Physical Interfaces
References and next steps
Index of /pub/ADSL/DSL-2750U/Firmware. This firmware is only compatible with hardware revision С. Please take a look at string "H/ D-Link FTP D-Link DSL-2750u C1 - [OpenWrt Wiki] Techdata d-link dsl-2750u h w ver j1 firmware