Widemac SL-R720X / XDX-RN502J

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
• China XDX-RN502J
• DealExtreme_92141
• Unbranded_XDX-RN502J_V2.0

→ Install OpenWrt (generic explanation)

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. Use the sysupgrade image. 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. Note that option 1 does not work with the sysupgrade image; booting will fail on finding the root partition.

After installation, copy-paste the following configuration into /etc/config/network

config interface 'loopback'
      option ifname 'lo'
      option proto 'static'
      option ipaddr '127.0.0.1'
      option netmask '255.0.0.0'

config globals 'globals'
      option ula_prefix 'fd37:bd9a:2b09::/48'

config switch 'switch0'
      option enable '1'
      option enable_vlan '1'
      option reset '1'

config switch_vlan
      option vlan '1'
      option device 'switch0'
      option ports '0 6t'

config switch_vlan
      option vlan '2'
      option device 'switch0'
      option ports '1 2 3 4 6t'

config switch_port                                         
      option port '0'
      option pvid '1'

config interface 'lan'
      option force_link '1'
      option type 'bridge'
      option proto 'static'
      option ipaddr '192.168.1.1'
      option netmask '255.255.255.0'
      option ip6assign '60'
      option _orig_ifname 'eth0.2 wlan0'
      option _orig_bridge 'true'
      option ifname 'eth0.2'
      option nat '1'

config interface 'wan'
      option proto 'dhcp'
      option _orig_ifname 'eth0.1'
      option _orig_bridge 'false'
      option ifname 'eth0.1'
      option broadcast '1'

Reboot, and the network ports should be operational.

WARNING: The current OpenWrt image does not contain a valid configuration for the various wired network ports
on the device. As a result, wired networking broken until copy-pasting in the above configuration.

1. → Install OpenWrt

→ generic.debrick

→ failsafe_and_factory_reset

→ 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 / Backside label
Insert picture

Case Front:
Insert picture

Case Back:
Insert picture

Note: This will void your warranty!

• 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 5V ↔ 3.3V level shifter. Some of the boards are shipped with a populated header. Use 57600 8N1, hard & soft flow control OFF.

Insert photo of PCB with markings

• 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

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