Comtrend CT-536+

Comtrend CT 536+ / HG 536+ is based on a Broadcom proccessor (board ID 96348GW-11).

The OpenWrt correct firmware is openwrt-96348GW-generic-squashfs-cfe.bin, which can be directly flashed from the original firmware page.

Notice that ''Backfire'' does not implement the failsafe boot with the reset button yet, for this router. Failsafe can be triggered only through the serial line.

A usual procedure to flash with OpenWrt using the factory CFE bootloader:

1. Download your .bin image
2. Set up a LAN connection with the router, your computer having the IP 192.168.1.2 (on some Comtrend CT 536+ it has to be 192.168.1.100, so change to .100 if .2 doesn't work)
3. While pressing the reset button, power on the device and keep the button for 10 seconds
4. Once releasing the reset button, you can browse to http://192.168.1.1 and a web page will prompt you for a .bin firmware file. Provide the openwrt file and submit it.
5. Wait some minutes, and OpenWrt will be ready at 192.168.1.1.

This procedure will not overwrite the CFE bootloader, so you can use it later to reflash the router with any other firmware.

NOTE: Onboard DSL modem is NOT SUPPORTED

However you can connect an external modem bridged to a LAN port.

All required packages are already installed in the default image.To configure PPPoE with UCI, do this:

uci set network.wan.proto=pppoe
uci set network.wan.username=
uci set network.wan.password=
uci commit network && ifup wan

Note: if you need QoS for consistent low latency on an ADSL connection, which is a common scenario, you should consider installing the dsl-qos-queue package instead. It works much better than the Linux QoS because it does factor in the ATM overhead, which can be significant.

Install the qos-scripts package:

opkg install qos-scripts

Basic QoS configuration using UCI:

uci set qos.wan.upload=192            # Upload speed in KB
uci set qos.wan.download=2048         # Download speed in KB
uci commit qos

Start QoS and enable on next boot

/etc/init.d/qos start
/etc/init.d/qos enable

Model Number

Front of the casing

Back of the casing

Note: This will void your warranty!

To open the case remove the two rubber feet on the opposite site to the antenna jack, they will reveal two crosspoint screws.

Main PCB

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

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

Use a serial TTL adapter.

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

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

→ generic.debrick

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!

It has to be soldered, see here:
usb_mod

• 1 x LM7805 (Voltage regulator, consider a step-down model)
• 1 x Ceramic capacitor 0,33uF 20V
• 1 x Ceramic capacitor 0,1uF 5V
• 1 x Electrolytic capacitor 100uF 25V
• 3 x Resistors 15K 0,25W
• 1 x USB Connector

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