Hi! I don't have the answer for your question but may be you can help me with this device.
I have a wr703n router with original Chinese firmware version and I want flash it with DDWRT. The problem is that in the support device table in the wiki only appears wr703n v1 and not v1.x. I'm not sure if the firmware is compatible with the hardware version.
Which version of ddwrt have you installed in your router?