Netgear WNDR3400 CVNA

The WNDR3400 CVNA (Cablevision edition) default username and password is admin/optimum

Specs
Platform Serial Num. = ? FCC ID = PY309300116 Industry Canada ID = ? CPU Type = Broadcom BCM4718A1KFBG CS0927 P11 927053 N1 (BCM4718A1 SoC) MIPS Rev = ? CPU Speed = 480MHz (530?) Bus = ? Flash Type = Serial Flash Chip = MX B09423 25L6405DMI-126 36498400 Flash Size = 8 MB Max Firmware Size = 7929856 bytes or 7744 KBytes RAM Size = 64 MB RAM Chip = Samsung 946 K4T51163QG-HCE6 CJJ355P1C nvram Size = 64K ETH chip1 = ? Switch = Broadcom BCM5325EKQMQ (BCM5325E) Port-based vlan = ? 802.1q vlan = ? Ethernet Port Count = 1-10/100-WAN 4-10/100-LAN Wired Standard = IEEE 802.3/3u Ethernet interface OUI = ? boot_wait = ? bootloader = CFE Flash Card Socket/Type = No SD/MMC Mod Support = No Expansion IF types = No PoE = No Power = 12 VDC, 0.5 A Connector type/size = ? LEDs/Color = Green/Amber/Blue Size = 23 x 153 x 31 mm (8.8 x 6.0 x 1.2 in) USB = 1x USB 2.0 Serial Port = Yes JTAG Port = Yes Supported by TJTAG 3.02 = ? Supported by dd-wrt as of = 17567 dd-wrt K2.4 Support = No dd-wrt K2.6 Support = Yes Special Features = Dual-Radio Radio (wl0) Wireless Radio = Broadcom BCM4718A1 (SoC) Wireless interface OUI = ? Antenna Connector Type = Internal MIMO status = ? Wireless Standard = IEEE 802.11b/g/n 802.11n = up to 300 Mbps 802.11g = 6, 9, 12, 18, 24, 36, 48, 54 Mbps 802.11b = 1, 2, 5.5, 11 Mbps WiFi Operating Frequency = 2.4 GHz Radio cor_rev = ? Radio Capabilities = ? Radio (wl1) Wireless Radio = Broadcom BCM43224KMLG CA0942 P20 941256 4 (BCM43224) Wireless interface OUI = ? Antenna Connector Type = Internal MIMO status = ? Wireless Standard = IEEE 802.11a/n 802.11n = up to 300 Mbps 802.11a = 6, 9, 12, 18, 24, 36, 48, 54Mbps WiFi Operating Frequency = 5 GHz Radio cor_rev = ? Radio Capabilities = ? Other Default IP address = ? Default login user = ? Default login password = ? Default SSID = ? OEM = ? 3rd Party Firmware Support = ?

Links of Interest

 * WNDR3400 5g LED doesn't flash with activity
 * Netgear WNDR3300 v2 and WNDR3400
 * GURU's Netgear wndr 3400 uodate
 * Netgear WNDR3400 support - Can I help?

Flashing DD-WRT
NOTE: Requires K2.6 for DD-WRT, Do not flash anything else.

Initial flash must be with a tailed build, after which any build with -nv64k can be used.

Reverting
Per Eko There is simple way to flash original firmware. -with router running dd-wrt, telnet in, do "mtd erase linux", wait until finished (2-3 min), then type "reboot" -now router waits for new firmware - tftp the original .chk file (with your PC set to static IP 192.168.1.10 etc) -when tftp transfer finishes, wait 3-4 min...

JTAG Pinouts
J14

Serial Pinouts
JP1

Hardware Modification
WNDR3400v2 model will feature the BCM5358 chipset.