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File:Linksys WRT400N v1.0a.jpg Simultaneous Dual-Band Wireless-N Router |
NOTE: Do Not flash micro this router.
NOTE: During configuration or flashing a device, the only that should be hooked to the device is the computer and power.
Makes a great main router (gateway), will also work as a client, client bridge, repeater, repeater bridge. Although special steps are required as this is an Atheros based device.
Specs
Platform
Serial Num. = MUJ00 FCC ID = Q87-WRT400N Industry Canada ID = 3839A-WRT400N OEM Gemtek = WRTA-244N (WRTA-244N_V02) CPU Type = Atheros AR7161 rev 2 (0xaa) MIPS Rev = ? CPU Speed = 680MHz Bus = ? Flash Type = Serial Flash Chip = Winbond W25X64Vf1G 0920 Flash Size = 8MB Max Firmware Size = 7995392 bytes RAM Size = 32MB RAM Chip = Winbond W94525G6EH-5 nvram Size = Set by firmware Switch = Atheros AR8216 Port-based vlan = No 802.1q vlan = No Ethernet Port Count = 1-10/100-WAN 4-10/100-LAN Wired Standard = IEEE 802.3/3u boot_wait = ? bootloader = U-Boot Flash Card Socket/Type = No SD/MMC Mod Support = No MiniPCI slots = No PoE = No Power = 12V/1.5A Color of LEDs = Blue/Amber Size = 8.07" x 1.38" x 6.30" (205 x 35 x 160 mm) USB = No Serial Port = 1 JTAG Port = Yes Supported by TJTAG/Version = No Supported by dd-wrt as of = 14039 Supported by OpenWRT as of = 10.03 Supported by Gargoyle as of = See OpenWRT Special Features = Dual Radio, Simultaneous Transmission
Radio (ath0)
Wireless Radio = Atheros AR9223 WLAN DSP processor = ? Antenna Connector Type = 2x2, Internal Wireless Standard = IEEE 802.11b/g/n WiFi Operating Frequency = 2.4GHz 802.11n Draft = up to 300Mbps 802.11g = 6, 9, 12, 18, 24, 36, 48, 54Mbps 802.11b = 1, 2, 5.5, 11Mbps Radio cor_rev = ? Radio Capabilities = ?
Radio (ath1)
Wireless Radio = Atheros AR9220 WLAN DSP processor = ? Antenna Connector Type = 2x2, U.FL, Internal Wireless Standard = IEEE 802.11a/n WiFi Operating Frequency = 5GHz 802.11n Draft = up to 300Mbps 802.11a = 6, 9, 12, 18, 24, 36, 48, 54Mbps Radio cor_rev = ? Radio Capabilities = ?
Links of Interest
Flashing
Flashing DD-WRT
Files needed:
- (14289) linksys-to-ddwrt-firmware.bin - For first time flashing only
- (14289) wrt400n-firmware.bin
- Do a Hard reset or 30/30/30 on the router
- Set a static IP on your computer to 192.168.1.7. Subnet mask should be 255.255.255.0.
- 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.
- Power cycle the router (uplug the power from the router for 30 seconds and then plug it back in)
- 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.
- Leave the username blank and enter "admin" as the password
- Go to administration and firmware upgrade
- Navigate to the folder that you are using, and select linksys-to-ddwrt-firmware.bin
- Hit upgrade
- When you get a success, wait FIVE FULL minutes.
- 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.
- When you can access the dd-wrt webgui using a browser at 192.168.1.1, power cycle the router.
- 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.
- Go to administration and firmware upgrade
- Navigate to the folder that you are using, and select wrt400n-firmware.bin
- Hit upgrade
- When you get a success, wait FIVE FULL minutes.
- At this point you can choose to put a different build on, depending on what you needs are.
- Reset your computer ethernet connection to auto IP and auto DNS
Flashing OpenWRT
Flashing Gargoyle
Upgrading
If dd-wrt is already on the router follow these instructions. If stock firmware is on the router follow the flashing instructions.
- Check for recommended builds here first.
- Set your computer to a static IP of 192.168.1.7. (or to whatever subnet the router is on) Disable all firewalls and security. Disable wireless on your computer and only have the router connected to the flashing computer by the ethernet cable between the two.
- Hard reset or 30/30/30 (If the router supports it, if not, reset to defults in the GUI) prior to flashing. Wait. Check for password page on re-login and change password.
- Flash firmware. You can use the webgui except if you have a belkin router. (For belkin use tftp.exe to flash)
- Wait...at least three minutes. Lights should return to normal. See important2, below. Failing to wait is how most people brick their routers.
- Do a power cycle of the router. (Unplug the cord, count to 30 and plug it back in.)
- Wait for the lights to return to normal usually about 2 minutes.
- Hard reset or 30/30/30 again (If the router supports it, if not, reset to defults in the GUI). Wait. Check for the password page and re-login to change the password. Then you can reconfigure your settings manually.
- Once configured set your computer back to autoIP and autoDNS.
Important1: This Hard reset or 30/30/30 works fine for Asus router, but you do have to power cycle after the reset.
Important2: After you flash the firmware, and before you do the hard reset, the router will be building some nvram settings. YOU MUST WAIT FOR THIS TO FINISH PRIOR TO DOING ANYTHING WITH THE ROUTER INCLUDING A HARD RESET. Usually, you can tell when this process is completed by the WAN light coming on, but it does take several minutes. Go have a beer. There are starting to be more and more people who BRICK their routers by not waiting until the nvram is rebuilt, PRIOR to doing a hard reset. YOU NEED TO WAIT!
DD-WRT Reverting
TFTP Revert
TFTP flash revert reported working by LOM
GUI Revert
Special thx to LOM, who created the file.
- Restore factory defaults via dd-wrt GUI.
- Set static IP address to 192.168.1.10
- Goto firmware upgrade, click browse, find the revert file WRT400N_webrevert.bin, click upgrade.
- IMPORTANT: wait 5 minutes
- Enter 192.168.1.1 in the web browser.
- At the prompt, leave the username blank and enter "admin" w/o the quotes as the password.
- Don't forget to set your IP back to Obtain an IP address automatically.
JTAG/Serial Info
JTAG
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/CDINT13o o14VREF
JTAG Recovery
TJTAG doesn't support this router.
Serial
Serial Pinouts
GND 4 o TX 3 o RX 2 o VCC 1 o
Hyper terminal Setup in Windows XP
In Windows XP, Click Start Button - All Programs - Accessories - Communication - HyperTerminal Enter a name for the connection, Click ok Choose com port you adapter is plugged into, Click ok Set: Bits per second = 115200 Data Bits = 8 Parity = none Stop bits = 1 Flow control = none Click ok Click File - Save As, and select a place to save it to so you don't have to enter the settings again.
Putty Setup in Windows XP
After installing putty, run it Serial line = The COM port your using for serial (ie. COM3) Speed = 115200 Click on Serial under Connection Serial line to connect to = same as above (Serial line) Speed (baud) = 115200 Data bits = 8 Stop bits = 1 Parity = None Flow control = None Click Session Enter a name for your connection under saved sessions Click Save Click Open
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
tftpboot 0x80010000 openwrt-to-dd-wrt.bin
and if you get a successful tftp transfer then:
erase 0xbf040000 +0x600000 cp.b 0x80010000 0xbf040000 0x600000
Then enter
boot
Pictures
FCC Pictures
Notes
Known Issues
Running dd-wrt 14144
- Still has constantly blinking wireless LED Ticket #1420
- Still has LAN MAC sudo matching ath1's MAC Ticket #1435
- Security LED still doesn't come on when security is set Ticket #1434
- Site Survey for ath0 shows double and triple the SSID's for the same MAC address Ticket #1431
- TX Power setting have no affect Ticket #1433
- 5ghz rate always says auto rather then actually speed Ticket #1436
- Site Survey now works for ath1 (5GHz)
Running dd-wrt 14039
Lan Speed Test Results (if setting is not listed it is default)
5GHz - ath1
Wireless Network Mode - N-Only (5GHz)
Channel Width - Turbo (40MHz)
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:----6,029,418--------3,528,420 Bits Per Seecond:----48,235,344-------28,227,360 Mbps:----------------46.0008087-------26.9197083
Problems Seen thus far on dd-wrt...
- MAC address on mine are screwed up like my wrt600n. wl1 and LAN MAC are the same. They weren't in the Linksys firmware.
- The wireless led blinks every 0.5-1 second without stop. just blinks and blinks and blinks, etc...
- Posting across 2.4GHz Client Bridge right now. Bridged to wrt600n.
- 5GHz Client Bridge very unstable, won't maintain connection with wrt600n. Keeps changing the channel when reconnecting. Maybe result of reconnection.
- Upgrade went smooth. Haven't tested client connections to the wrt400n.
- Wireless Security LED doesn't come on when security is set.
- 5GHz is lacking channels when set as AP
Hardware Modification
Antenna Mod
Note: This is for 5GHz band only. The 2.4GHz band antenna wires are soldered to the board.