💡 : If the standard update fails or your current firmware is version 1.0.10, D-Link recommends using "Emergency Mode" (Recovery Mode). Power off the router. Hold the Reset button with a paperclip.

Only flash the standard MTD3 firmware. Keep the stock D-Link MTD1 backup safe.

To install or update the firmware on your D-Link DSL-2750U Hardware Revision C1

No. The DSL-2750U C1 uses a Broadcom chipset with a closed-source ADSL driver. OpenWrt does not support the C1 revision. You are stuck with official D-Link firmware.