Netgear WNDR3400v3

Overview
The BCM43236 used would appear (or would be likely) to vary..
 * At least some production units would appear to be using BCM43236B
 * The FCC docs show the device w/ Broadcom BCM43236
 * (BCM43236KMLG, HT1127 P20, 146859 6 W)

The default SSID formats are probably NETGEARXX and NETGEARXX-5G.

Custom Firmware

 * Netgear WNDR3400 on OpenWrt Wiki
 * DD-WRT for NETGEAR WNDR3400 v3 (unofficial)

FreshTomato

 * To Know More About FreshTomato

FreshTomato Instructions

 * Flashing Instructions link

download link

 * Use newer builds navigate by year, year-build#, K26RT-N, Netgear WNDR-series folder there are two builds MiniIPv6, VPN

Linksysinfo forum

 * for support create an account for tomato firmware

Serial Pinouts

 * tp16 = GND
 * tp15 = RX
 * tp12 = TX

nvram show
Netgear WNDR3400v3/nvram