This is a white-label mass-market ralink-based router produced by Bococom, selling under the Widemac SL-R720X label. The device is sometimes also referred to as XDX-RN502J, a string that appears prominently on the PCB board. Some of the devices ship with openwrt preinstalled.

• 3G-52 from CD-R King
• Aceex 22NRY
• possibly the Asus RT-N13U

Get an image built that includes r30809 or build one yourself from trunk.

Please check out the article Flash Layout. It contains an example and a couple of explanations.

On this device, flash layout is the following:

auto-created partitions at boot: mtd: partition "rootfs" set to be root filesystem mtd: partition "rootfs_data" created automatically, ofs=2E0000, len=120000

OpenWrt was installed with the serial port and tftp method. There is currently no known way to flash directly from the built-in firmware. So, follow generic.flashing.tftp for general setup of a tftp server and firmware to load. Set your terminal to 57600 bauds, 8,N, 1. At boot, you will see the following on your serial terminal:

please choose the operation: 1: Load system code to SDRAM via TFTP. 2: Load system code then write to Flash via TFTP. 3: Boot system code via Flash (default). 4: Entr boot command line interface. 9: Load Boot Loader code then write to Flash via TFTP.

choose 2, then answer the prompts.

1. → obtain.firmware
2. → Install OpenWrt

→ generic.debrick

→ generic.failsafe

→ generic.sysupgrade

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.

• Browse to http://192.168.1.1/cgi-bin/luci/mini/system/upgrade/ LuCI Upgrade URL
• Upload image file for sysupgrade to LuCI
• Wait for reboot

• Login as root via SSH on 192.168.1.1
• Use the following commands to upgrade.

cd /tmp/
wget http://downloads.openwrt.org/snapshots/trunk/XXX/xxx.abc
sysupgrade /tmp/xxx.abc

• If sysupgrade does not support this router, use the following commands.

cd /tmp/
wget http://downloads.openwrt.org/snapshots/trunk/XXX/xxx.abc
mtd write /tmp/xxx.abc linux && reboot

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

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

The SL-R720X devices has one button. In the original configuration it resets the router when pressed for 5 seconds and switches WPS mode when pressed for only 1 second.

The default network configuration is:

Numbers 1-4 are ports 1-4 as labeled on the unit, number 0 is the Internet (WAN) on the unit, 6 is the internal connection to the router itself. vlan0 = eth0.0, vlan1 = eth0.1 and so on.

Model Number

Top:

Bottom:

Connectors:

Detacheable Antennas

Note: This will void your warranty!

• To open the case carefully peel off the rubber feet without ripping them apart if you want to reattach them later. There is one screw beneath each of these feet. Unscrew them and you will be able to take off the top and bottom to access the PCB.

Main PCB top:

Main PCB bottom:

• To remove the cover just unscrew the four corner phillips screws under the rubber feet.

PCB Top

PCB bottom

The serial port is on the unpopulated header labelled "console"/"J2". Pins are, from the pin closest to J2 Gnd, Rx, Tx, Vcc. Use a level shifter. Some of the boards are shipped with a populated header. Use 57600 8N1, hard & soft flow control OFF.

Photo of PCB with markings

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

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

Photo of PCB with markings

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!

• https://forum.openwrt.org/viewtopic.php?id=34878
• http://www.dd-wrt.com/phpBB2/viewtopic.php?t=82160
• http://www.dd-wrt.com/phpBB2/viewtopic.php?t=61162