This device is NOT RECOMMENDED for future use with OpenWrt due to low flash/ram.
DO NOT BUY DEVICES WITH 4MB FLASH / 32MB RAM if you intend to flash an up-to-date and secure OpenWrt version onto it! See 4/32 warning for details.

1) This device does not have sufficient resources (flash and/or RAM) to provide secure and reliable operation.
This means that even setting a password or changing simple network settings might not be possible any more, rendering the device effectively useless. See OpenWrt on 4/32 devices what you can do now.

2) OpenWrt support for this device has ended in 2022.
19.07.10 was the last official build for 4/32 devices.

WARNING: Do not confuse the DG834G v4 with versions v1 and v2, v3 or DG834GT!

Also note that the Wifi chip for this router is the Broadcom BCM4318 chip and not the atheros.

Router DG834v4 (same model, but without wifi) has the same firmware.

Router DG834GBv4 is interchangeable with this, but installation instructions does not apply because of differences in original OEM firmware.

SoC CPU Freq Ram Flash Network USB Serial JTag
Broadcom BCM6348 240MHz 16MiB 4MiB 4 x 1 possible Yes Yes


  • There is NO support for the ADSL modem currently!
  • USB layout is unknown.

Download OpenWrt:

  1. Download the latest OpenWrt for the brcm63xx chipset from I used openwrt-15.05-brcm63xx-generic-96348GW-10-generic-squashfs-cfe.bin.

Download the source code from netgear:

Download the original firmware:

  1. Download the original firmware from (or build from the source code)

Generate the .img file (which can be used for upgrading through the OEM web interface):

  1. Get the makeImage binary, which is available in the source code provided by netgear (see above). makeImage does the following:
    1. copies the first 64 KiB (65536 bytes) from the start of the original image (DG834GV4_V5.01.16.img). This copies the the bootloader or CFE?
    2. copies the entire filesystem file (the openwrt .bin file)
    3. copies about 96 bytes from the end of the original image.
    4. padding with null bytes to an 8KiB boundary.
  2. combine OpenWrt and the original firmware:
    1. ./makeImage my-DG834Gv4-firmware.img netgear/DG834Gv4_V5.01.16.img openwrt-15.05-brcm63xx-generic-96348GW-10-generic-squashfs-cfe.bin

Preparing the router to upload the firmware:

  • Power down DG834Gv4 and disconnect the DC plug from the rear of the unit.
  • Wait 5-10 seconds.
  • Switch on the DC adapter at the mains switch.
  • With the reset button pressed, plug the DC adapter plug into the rear of the DG834Gv4.
  • Wait 5-10 seconds and not release the reset button.
  • The power button starts to blink green and red alternatively.

If you have linux installed:

  1. Compile NFTP utility:nftp.c (more info in:
  2. ./nftp -u eth0 miOpenWrt_DG834Gv4.img

If you only have windows installed, the procedure is as follows:

Note: only works on windows 32bit

Please check out the article flash.layout. It contains an example and a couple of explanations.

Partition Size EraseSize Name Function
mtd0 00010000 00002000 “CFE” bootloader
mtd1 000dff00 00010000 “kernel” kernel
mtd2 00300000 00010000 “rootfs” root file system
mtd3 000b0000 00010000 “rootfs_data” conf, packages
mtd4 00010000 00010000 “nvram” OEM conf
mtd5 003e0000 00010000 “linux” upgrade
FIXME The instructions below are for Broadcom devices and only serve as an example. Don't leave them in place if they do not apply to a particular device!

This section deals with how you install OpenWrt from a device freshly opened. Plus the steps required such as reset to factory defaults if the device has already been configured

Note: Reset router to factory defaults if it has been previously configured.

If you want to upgrade using TFTP you follow these steps (as an alternative to the above install process).


If you have already installed OpenWrt and like to reflash for e.g. upgrading to a new OpenWrt version you can upgrade using the mtd command line tool. It is important that you put the firmware image into the ramdisk (/tmp) before you start flashing.

LuCI Web Upgrade Process

Terminal Upgrade Process

  • Login as root via SSH on
  • Use the following commands to upgrade.
cd /tmp/
sysupgrade /tmp/
  • If sysupgrade does not support this router, use the following commands.
cd /tmp/
mtd write /tmp/ linux && reboot

Basic configuration After flashing, proceed with this.
Set up your Internet connection, configure wireless, configure USB port, etc.

The default network configuration is:

Interface Name Description Default configuration
br-lan LAN & WiFi
vlan0 (eth0.0) LAN ports (1 to 4) None
vlan1 (eth0.1) WAN port DHCP
wl0 WiFi Disabled


Numbers 0-3 are Ports 1-4 as labeled on the unit, number 4 is the Internet (WAN) on the unit, 5 is the internal connection to the router itself. Don't be fooled: Port 1 on the unit is number 3 when configuring VLANs. vlan0 = eth0.0, vlan1 = eth0.1 and so on.

Port Switch port
LAN 1 3
LAN 2 2
LAN 3 1
LAN 4 0


GPIO line Connected
0 Green LED Power
1 Red LED Power
2 LED Dsl
3 LED Internet

hardware.button on howto use and configure the hardware button(s).

The Netgear DG834G V4 has only one button:

Reset reset 6
Instruction set: MIPS
Vendor: Broadcom
bootloader: CFE
Board ID: 96348W3
System-On-Chip: BCM6348SKFBG
CPU/Speed BMIPS3300 V0.7 / 240 MHz
Flash-Chip: Spansion S29GL032A90TFIR4
Flash size: 4 MiB
RAM: EM638165TS-6G / 16 MiB / 166MHz
Wireless: Broadcom 4318 11b/g
Ethernet: BCM5325 w/ vlan support swconfig
Internet: ADSL2+
USB: possible 1 x 1.1
Serial: Yes

Model Number

Photo of front of the casing

Photo of back of the casing

Note: This will void your warranty!

Main photo of PCB

Back photo of PCB

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

Serial console is J521. Settings are: 115200, 8, n, 1

How to connect to the Serial Port of this specific device:

NOTE: R521, R522 and R523 are missing on the DG834Gv4, (it could be 1 kiloohm).

Pint out Line
2 Tx
3 Vcc
4 Rx

Photo of PCB and resistors unpopulated:

port.jtag general information about the JTAG port, JTAG cable, etc.

How to connect to the JTAG Port of this specific device:

Netgear DG834 comes with standard 12-pin JTAG interface. The JTAG port is J201.

Name signal Pint out Pin out Name signal
TCK 9 10 GND
nSRST 11 12 n/a

Example of use:

JTAG XILIX Parallel Port
11 nSRST
9 TCK ---------100R--------- D1, Pin 3
7 TMS --------100R--------- D2, Pin 4
5 TDO --------100R--------- Select, Pin 13
3 TDI ---------100R--------- D0, Pin 2
2 GND --------------------------------------- GND, Pines 20, 25

Photo of PCB with connector

  1. you could read about bootloader in general
  1. as a beginner, you really should inform yourself about soldering in general and then obtain some practical experience!
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  • Last modified: 2021/12/05 11:52
  • by tmomas