Linksys WAP54G v3.1

Overview
OEM Gemtek WAPB-162GL (WAPB-162GL_V00)

WAP54G v3.1 serial numbers appear to start with MDG3.

WAP54G series on the OpenWrt wiki On the DD-WRT wiki

Flashing dd-wrt

 * Flashing Linksys WAP54G All Versions