Dynex DX-E402 v2.0

"MODEL: Cable/DSL Router", "REV: 1.0", and a date code of 1033 (Aug. 2010) is silkscreened on the board.
 * This device is using United and GTT capacitors.

It's believed to be running VxWorks.

Pinout
J3 [  ] (RxD) (TxD) (3.3) (GND)

Tx traces from Pin53 of 88E6218-LGO1. Rx traces from Pin52.

random commands @ shell
Of all single letter commands usable at the boot menu, these would seem to be the only ones that work (as well as M) ..