When i plug in the USB-to-Serial Port Adapter, all the network port LEDs on the router would start to flash continuously, and the network connection will also turn on and off repeatedly. I put in a powered USB hub but the problem still persists. This happen for firmware version 1.21 and 1.32. My hardware version is A3, and the USB-to-Serial Port Adapter is prolific chipset.
Anyone has experienced this? Or is there other brand of USB-to-Serial Port Adapter that is compatible with this router?