Linksys WRT400N

Overview
OEM Gemtek WRTA-244N (WRTA-244N_V02)

The power adapter included with the device is a Leader Electronics MU18-D120150-A1 (12V, 1.5A).

Links of Interest

 * On the DD-WRT wiki
 * On the OpenWrt wiki
 * Listed on the 'Linksys routers' page on Wikipedia
 * Bricked a Cisco/Linksys WRT400N... Help?
 * DD-WRT on WRT400N? @ DD-WRT
 * Linksys WRT400N Support @ DD-WRT
 * Wireless-N Throughput Testing @ DD-WRT
 * About button handler @ Gargoyle

Flashing DD-WRT
Linksys WRT400N on dd-wrt wiki

DD-WRT nvram=64

Files needed:


 * (14289) linksys-to-ddwrt-firmware.bin - For first time flashing only
 * (14289) wrt400n-firmware.bin


 * 1) Do a Hard reset or 30/30/30 on the router
 * 2) Set a static IP on your computer to 192.168.1.7. Subnet mask should be 255.255.255.0.
 * 3) Connect the lan cable from your computer to a LAN port of your router. Make sure your router is plugged in. Nothing should be connected to your computer or the router except the lan cable between them. Turn your firewall and any wireless computer connections OFF.
 * 4) Power cycle the router (uplug the power from the router for 30 seconds and then plug it back in)
 * 5) Open your browser to 192.168.1.1 by putting that in the browser address window of your browser. You should open the linksys webgui and NOT a page that says Management Mode. If you see management mode, power cycle the router again.
 * 6) Leave the username blank and enter "admin" as the password
 * 7) Go to administration and firmware upgrade
 * 8) Navigate to the folder that you are using, and select linksys-to-ddwrt-firmware.bin
 * 9) Hit upgrade
 * 10) When you get a success, wait FIVE FULL minutes.
 * 11) If you don't get success, repeat from steps 6 up to this one. If you still don't get success, clear your browser cache. Try using a different browser as well, to navigate to 192.168.1.1.
 * 12) When you can access the dd-wrt webgui using a browser at 192.168.1.1, power cycle the router.
 * 13) When you can again access the dd-wrt webgui using a browser at 192.168.1.1, do another Hard reset or 30/30/30 on the router.
 * 14) Go to administration and firmware upgrade
 * 15) Navigate to the folder that you are using, and select wrt400n-firmware.bin
 * 16) Hit upgrade
 * 17) When you get a success, wait FIVE FULL minutes.
 * 18) At this point you can choose to put a different build on, depending on what you needs are.
 * 19) Reset your computer ethernet connection to auto IP and auto DNS

Flashing OpenWRT

 * Linksys WRT400N on OpenWrt

Flashing Gargoyle

 * Linksys WRT400N

TFTP Revert
TFTP flash revert reported working by LOM
 * Linksys WRT400N Revert to Linksys firmware

GUI Revert
Special thx to LOM, who created the file.


 * 1) Restore factory defaults via dd-wrt GUI.
 * 2) Set static IP address to 192.168.1.10
 * 3) Goto firmware upgrade, click browse, find the revert file WRT400N_webrevert.bin, click upgrade.
 * 4) IMPORTANT: wait 5 minutes
 * 5) Enter 192.168.1.1 in the web browser.
 * 6) At the prompt, leave the username blank and enter "admin" w/o the quotes as the password.
 * 7) Don't forget to set your IP back to Obtain an IP address automatically.

JTAG Pinouts
 nTRST  1o o2	 GND TDI  3o o4	 GND TDO  5o o6	 GND TMS  7o o8	 GND TCK  9o o10	 GND nSRST 11o o12  N/C N/C 13o o14  N/C

Serial Pinouts
 GND 4 o  TX  3 o  RX  2 o VCC  1 o

DD-WRT Serial Recovery
To recover from a bad flash and get back to DD-WRT.....

Download openwrt-to-dd-wrt.bin, Don't worry about the name, it will get you back to DD-WRT.

Download TFTP32

Configure PC to 192.168.1.88

Install TFTP32

Set it up as server, browse to where the recovery file is.

Then in telnet(putty or hyper terminal) enter and if you get a successful tftp transfer then: Then enter

Pictures
Cisco's Images

Known DD-WRT Issues
Running dd-wrt 14144


 * 1) Still has constantly blinking wireless LED Ticket #1420
 * 2) Still has LAN MAC sudo matching ath1's MAC Ticket #1435
 * 3) Security LED still doesn't come on when security is set Ticket #1434
 * 4) Site Survey for ath0 shows double and triple the SSID's for the same MAC address Ticket #1431
 * 5) TX Power setting have no affect Ticket #1433
 * 6) 5 GHz rate always says auto rather then actually speed Ticket #1436
 * 7) Site Survey now works for ath1 (5 GHz)

Running dd-wrt 14039

Lan Speed Test Results (if setting is not listed it is default) 5 GHz - ath1 Wireless Network Mode - N-Only (5 GHz) Channel Width - Turbo (40 MHz) Control Channel - upper

Laptop w/ Linksys WPC600N  Writing---Reading Packet Length:---104,857,600--104,857,600 Time to complete:17.3910000---29.7180000 Bytes Per Second:6,029,4183,528,420 Bits Per Seecond:48,235,344---28,227,360 Mbps:46.0008087---26.9197083 Problems Seen thus far on dd-wrt...
 * 1) MAC address on mine are screwed up like my wrt600n. wl1 and LAN MAC are the same. They weren't in the Linksys firmware.
 * 2) The wireless led on solid
 * 3) Posting across 2.4 GHz Client Bridge right now. Bridged to wrt600n.
 * 4) 5 GHz Client Bridge very unstable, won't maintain connection with wrt600n. Keeps changing the channel when reconnecting. Maybe result of reconnection.
 * 5) Upgrade went smooth. Haven't tested client connections to the wrt400n.
 * 6) Wireless Security LED doesn't come on when security is set.
 * 7) 5 GHz is lacking channels when set as AP

Antenna Mod
Note: This is for 5 GHz band only. The 2.4 GHz band antenna wires are soldered to the board.
 * No solder antenna upgrade kit