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T-Home Speedport W 303V Typ B

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 (18.06 or later) 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 will end after 2019.
19.07 will be the last official build for 4/32 devices. After 19.07, no further OpenWrt images will be built for 4/32 devices. See OpenWrt on 4/32 devices what you can do now.

The T-Home Speedport W 303V is a IAD sold by T-Com with a ADSL2+ Annex B Modem, 11n Wifi and two FXS ports as well as a S0 bus connector.

There are 2 models of it, “Typ A” and “Typ B” having completely different hardware. Click here for "Typ A".

Supported Versions

Hardware Highlights

ModelVersionSoCCPU MHzFlash MBRAM MBWLAN HardwareWLAN2.4WLAN5.0100M portsGbit portsModemUSB
Speedport W 303V Typ BBroadcom BCM6358300832Broadcom BCM4322b/g/n-1-ADSL2+ Annex B-


OEM easy installation

This section deals with how you install OpenWrt from a device freshly opened.

  • Configure your PC to use an IP from (not .1)
  • Press and hold reset, power on the device
  • Wait until all leds are lit, then stop pressing reset
  • Browse to
  • Upload openwrt-SPW303V-squashfs-cfe-factory.bin file to router
  • Wait for it to reboot
  • Telnet to and set a root password, or browse to if LuCI is installed.

NOTE: If you are using this to recover from a non working flash, you have to first upload a stock firmware using the same procedure, then flash OpenWrt.

Upgrading OpenWrt


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

Note: You need the -sysupgrade.bin file for upgrading.

LuCI Web Upgrade Process

  • Browse to LuCI Upgrade URL
  • Upload image file for sysupgrade to LuCI
  • Wait for reboot

Terminal Upgrade Process

  • Login as root via SSH on
  • Use the following commands to upgrade.
cd /tmp/
sysupgrade openwrt-SPW303V-squashfs-cfe-sysupgrade.bin



The bootloader (CFE) has a web interface for uploading firmware images. Press your reset button while powering up the device, wait ~20seconds, then release the reset button. All LEDs should light. Your device will be accessible on the address with a very simple webpage where you can upload a new image. The device will not start a DHCP server, you will have to configure your host to the 192.168.2.x subnet.

Ps. do not try to upload images with TFTP using the flashimage command in your CFE prompt, because it does not works.



Architecture MIPS
Vendor Broadcom
bootloader cfe
Board Id 96358-502V
System-On-Chip BCM6358
CPU/Speed BMIPS4350 V1.0 / 300 MHz BMIPS Dual Core
Flash-Chip :?:
Flash size 8 MiB
RAM size 32 MiB
Wireless Broadcom BCM4322
Wireless standard 802.11b/g/n
Ethernet Internal PHY
Internet ADSL2+ Annex B (unsupported)
Serial Yes

Opening the case

  • To remove the cover you have two remove two screws, then open a total of eight plastic clips. These are very easy to break.



The Speedport W 303V comes pre equipped with a serial header with 3.3V TTL. The serial console is available on J3

serial connector J3

       | o | GND
       | o | RX
       | o | TX
       | o | 3.3V

  <Ethernet/RJ45 Ports are on this side>

The serial port is the typical 3.3V TTL serial commonly found on router and router-like devices, NOT a PC-style RS-232 serial, with it's different signaling voltages. It's 115200 8-N-1 without hardware or software control.

Basic configuration

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

Specific Configuration


The default network configuration is:

Interface Name Description Default configuration
br-lan LAN & WiFi
eth0 LAN port None
wl0/wlan0 WiFi Disabled


Installation the proprietary Broadcom drivers

opkg install kmod-brcm-wl wlc

Failsafe mode


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

The Speedport W 303V has two buttons. They are Reset and Secure Easy Setup. Here, we merely name the buttons, so we can use them in the above Howto:

Reset reset
Secure Easy Setup ses

there is a problem with the latest trunk - feb 2014 . the router always boot into failsafe - caused by the button config. take a look at


The Bootloader (CFE) is password protected. To abort autoboot you have to either hold the reset button long enough to enter recovery mode or enter TCO& when it counts down for autoboot.


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toh/t-com/spw303v-b.txt · Last modified: 2019/02/12 19:22 by tmomas