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D-Link DSL-2740B/DSL-2741B

The D-Link DSL-274xB is a four port wireless router with integrated ADSL2+ modem. The x differentiates the ADSL Annex supported; 0 is Annex A and 1 is Annex B.

:!: As with all BCM63XX devices, there is no support for the integrated DSL modem. :!:


Version/Model OpenWrt Version Supported Model Specific Notes
C2/C3 trunk -
E n/a external switches are not supported yet
F1 12.09-rc2 switch configuration is incorrect in current trunk, all working well on 12.09-rc2


OEM easy installation

These devices can be easily flashed through the generic CFE recovery webserver:

  • Press and hold the reset button
  • Power on the device
  • Wait until the power LED turns solid red (after about 30 seconds)
  • Upload the image

Upgrading OpenWrt

Specific Configuration

Switch Ports (for VLANs)

Numbers 0-3 are Ports 1-4 as labelled on the unit, in reverse order (so internal port 0 is external 3, 1 is 2, etc).

Failsafe mode



Revision C2,C3 Revision E1 Revision F1
Architecture: MIPS
Vendor: Broadcom
Bootloader: CFE
System-On-Chip: BCM6358 BCM6328
CPU/Speed 4Kc 300 Mhz 4Kc 320 Mhz
Flash-Chip: varies
Flash size: 4096 KiB 8192 KiB
RAM: 32 MiB 64 MiB
Wireless: Broadcom BCM4321 802.11bgn Atheros AR9287 802.11bgn
Ethernet: Broadcom BCM5325e Realtek RTL8306 (integrated in SoC)
Internet: ADSL2+ (unsupported)
Serial: Yes, Pin Header

Opening the case

Note: This will void your warranty!

For Revision C2 (and probably C3):

  • Remove the screws under all four rubber feet
  • Lift the top case (it should not provide much resistance)

For Revision F1

This model is tricky to open as it has a total of seven plastic clips holding the top. You might need brute force, and there are chances you will damage your case.

  • Remove the screws under all four rubber feet
  • For the front clips: using two flat head screw drivers push bottom "grill" out until you can lift the top slightly
  • For the front side clips: using a flat head screw driver push the bottom out until it clicks (slide it in from the corner, then work yourself to where the clip is)
  • For the back side clips: these should be easy now with some wiggling


See port.serial for general information about the serial port, serial port cable, etc.

The Pinout is (with the Ethernet ports on top):



Reverting to original Firmware

For reverting to the original firmware, obtain the firmware from D-Link and flash it using the OEM easy installation.


toh/d-link/dsl-2740b.txt · Last modified: 2014/06/13 15:49 by uti_bait