Netgear WNR1000v3

Overview
"U12H139T99" and "Rev.0 GP" is silkscreened on the boards.
 * The same hardware is also used for the Netgear WGR614v10.

OUIs may include 20:4E:7F, 84:1B:5E OUI

Serial Pinouts
(GND) (TxD) (...) (...) (RxD) (+3.3v) o    o     o     o     o     o  6     5     4     3     2     1 J3