TP-LINK TL-MR3420 v1

300Mbps Wireless 3G Router / 3G/3.75G Wireless N Router Product page Firmware

"20503420-1.0" and "Rev:1.0sp1" is silkscreened on the board in the FCC photos. "2050500114" and "Rev:1.0" is silkscreened on a v1.2 model.

TL-MR3420 on the OpenWrt wiki On the DD-WRT forums