Linksys WRT54G v4.0

Linksys WRT54G v4

Manuf/OEM/ODM CyberTAN

FCC approval date: 31 May 2005
Country of manuf.: China
Serial Num Prefix: CDFA
Series: WRT54G

Local image

Type: wireless router

FCC ID: Q87-WT54GV40

Power: 12 VDC, 1 A
Connector type: barrel
Conn. measurements: 5 mm (OD), 2.5 mm (ID), 12 mm (LEN)

CPU1: Broadcom BCM5352E (200 MHz)
FLA1: 4 MiB

4,194,304 B
32,768 Kib
4,096 KiB
32 Mib
0.00391 GiB

(Intel TE28F320C3BD90)
RAM1: 16 MiB

16,777,216 B
131,072 Kib
16,384 KiB
128 Mib
0.0156 GiB

(Hynix HY5DU281622ET-J)

Expansion IFs: none specified
JTAG: yes, 12-pin header, unpopulated
Serial: yes, 10-pin header, unpopulated, (115200,8,N,1)

WI1 chip1: Broadcom BCM5352E
WI1 chip2: Broadcom BCM2050
WI1 802dot11 protocols: bg
WI1 antenna connector: RP-TNC

ETH chip1: Broadcom BCM5352E
Switch: Broadcom BCM5352E
LAN speed: 10/100
LAN ports: 4
WAN speed: 10/100
WAN ports: 1

bg

Stock bootloader: CFE

Stock FW OS: Linux

Third party firmware supported: DD-WRT • (List), Gargoyle, OpenWrt, Tomato • (List), TomatoUSB • (List), Broadband-Hamnet

Default SSID: linksys (51 addl. devices)
Default IP address: 192.168.1.1
the IP 192.168.1.1 is used by 1087 additional devices
of which 142 are Linksys devices
Default login user: blank
Default login password: admin
blank:admin credentials used by 275 additional devices
of which 140 are Linksys devices

802dot11 OUI: 00:14:BF (9 E, 14 W, 2005)
Ethernet OUI: 00:14:BF (9 E, 14 W, 2005)

	FCC ID
Linksys WRT54G-RG	Q87-WT54GV40
Linksys WRT54G-TM	Q87-WT54GV40
Linksys WRT54GL v1.0	Q87-WT54GV40
Linksys WRT54GL v1.1	Q87-WT54GV40
Linksys WRT54GS v3	Q87-WT54GV40
Linksys WRT54GS v4	Q87-WT54GV40
Linksys WRT54GS v5.0	Q87-WT54GV40
Linksys WRT54GS v5.1	Q87-WT54GV40

	CPU1 brand	WI1 chip1 brand	WI1 chip2 brand
Linksys WRT54G v1.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v1.1	Broadcom	Broadcom	Broadcom
Linksys WRT54G v2.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v2.2	Broadcom	Broadcom	Broadcom
Linksys WRT54G v3.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v3.1	Broadcom	Broadcom	Broadcom
Linksys WRT54G v4.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v5	Broadcom	Broadcom	Broadcom
Linksys WRT54G v5.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v6.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v7.0	Atheros	Atheros
Linksys WRT54G v7.2	Broadcom	Broadcom
Linksys WRT54G v8.0	Broadcom	Broadcom
Linksys WRT54G v8.1	Broadcom	Broadcom
Linksys WRT54G v8.2	Broadcom	Broadcom
Linksys WRT54GH	Ralink	Ralink

For a list of all currently documented Broadcom chipsets with specifications, see Broadcom.

---

Wireless-G Broadband Router

 • Support page • Downloads (US)

• Datasheet.pdf
• Quick Install.pdf
• User Guide.pdf

Links of Interest

• WRT54G series on Wikipedia
• Linksys WRT54Gxx page on the DD-WRT wiki
• WRT54G page on the OpenWrt wiki

Flashing

Flashing DD-WRT

 

• Linksys WRT54G v4.0

Install Guide

The stock firmware from Linksys on the WRT54G v4 won't accept a firmware image over 3MB in size (you will get the error: :"Upgrade are failed!" if you try) so you will need to flash the mini version of DD-WRT onto the router BEFORE flashing any other versions. Read the peacock announcement found here: http://www.dd-wrt.com/phpBB2/viewtopic.php?t-51486 Do a Hard reset or 30/30/30 on the router according to note 1 of the peacock announcement (30/30/30) 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 dd-wrt.v24_mini_generic.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. 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 Check for recommended builds here.

Flashing OpenWrt

• Linksys WRT54G

Flashing Gargoyle

• Install Guide

Upgrading

Upgrade DD-WRT

Updating DD-WRT 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!

Reverting

Reverting to OEM Firmware from DD-WRT

Reverting

Read the peacock announcement found here: http://www.dd-wrt.com/phpBB2/viewtopic.php?t-51486 Do a Hard reset or 30/30/30 on the router according to note 1 of the peacock announcement (30/30/30) 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 (unplug 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. Enter your username and password Go to administration and firmware upgrade Navigate to the folder that you are using, and select WRT54G_v4.21.1_fw.bin once you've unzipped it. Hit upgrade When you get a success, wait FIVE FULL minutes. When you can again access the Linksys webgui using a browser at 192.168.1.1, do another Hard reset or 30/30/30 on the router. Reset your computer ethernet connection to auto IP and auto DNS.

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/C

Using Universal JTAG Adapter

 white    1o o2	 black
   red    3o o4	 GND
  blue    5o o6	 GND
 green    7o o8	 GND
 yelow    9o o10  GND
 orange  11o o12  N/C

DD-WRT Recovery

Recovery

JTAG Recovery /noemw /nocwd switches required Backup CFE x2 (Compare the files, they must match exactly or there is something wrong with your JTAG setup) Erase Wholeflash x2 Flash CFE Unplug Power Unplug JTAG Cable TFTP Set Rig ip static 192.168.1.10 Plug network cable from rig to port 1 Get TFTP ready, server ip - 192.168.1.1, Password - blank, file - dd-wrt.v24_mini_wrt54g.bin Plug in power As soon as windows says "connected" hit upgrade. May have to use a network hub to make sure windows is always connected. Hard Reset 30\30\30 Serial Serial Pinouts VCC 1 o o 2 VCC TX1 3 o o 4 TX0 RX1 5 o o 6 RX0 N/C 7 o o 8 N/C GND 9 o o 10 GND 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 DD-WRT Serial Recovery Modified Redhawk0 instructions Connect Serial cable Start one of the programs from above Get TFTP ready with file selected Use dd-wrt.v24_mini_wrt54g.bin Connect power to the router start a rapid fire Cntl-C as you plug the router to power type "nvram erase" w/o quotes, hit enter type "flash -noheader : flash1.trx" w/o quotes, this starts the tftp daemon, hit enter but have tftp.exe ready Click go or start on TFTP give it 5 minutes after it finishes then power cycle....hard reset...then config when it stops spitting out txt in the serial console....hit the enter key...you should get a login prompt...at that point, power cycle it, Hard reset or 30/30/30...then config you'll see it boot up

USB Info

No USB

vlan Info

DD-WRT vlan Info

• WikiDevi:DD-WRT/VLAN Support

Defaults

"/proc/switch/eth0" exists

1 2 3 4 | case labels
3 2 1 0 | nvram port numbers

nvram show

root@DD-WRT:~# nvram show | grep vlan.ports vlan1ports=4 5 vlan0ports=3 2 1 0 5* size: 19872 bytes (12896 left) root@DD-WRT:~# nvram show | grep port.vlans port5vlans=0 1 16 port4vlans=0 port3vlans=0 port2vlans=0 port1vlans=0 port0vlans=1 size: 19872 bytes (12896 left) root@DD-WRT:~# nvram show | grep vlan.hwname vlan1hwname=et0 vlan0hwname=et0 size: 19872 bytes (12896 left) root@DD-WRT:~# lsmod Module Size Used by ip_nat_pptp 2560 0 (unused) ip_conntrack_pptp 3036 1 ip_nat_proto_gre 1664 0 (unused) ip_conntrack_proto_gre 2584 0 [ip_nat_pptp ip_conntrack_pptp] etherip 5104 0 (unused) switch-robo 5356 0 (unused) switch-core 6352 0 [switch-robo] root@DD-WRT:~# ls /proc/switch eth0 root@DD-WRT:~# cat /proc/switch/eth0/vlan/0/ports 0 1 2 3 5t* root@DD-WRT:~# cat /proc/switch/eth0/vlan/1/ports 4 5t root@DD-WRT:~# cat /proc/switch/eth0/vlan/2/ports 4 root@DD-WRT:~# nvram commands root@DD-WRT:~# nvram set vlan1ports="3 4 5" root@DD-WRT:~# nvram set vlan0ports="2 1 0 5*" root@DD-WRT:~# nvram commit root@DD-WRT:~# reboot nvram Port 1 moved to WAN vlan root@DD-WRT:~# nvram show | grep vlan.ports vlan0ports=2 1 0 5* vlan1ports=3 4 5 size: 19850 bytes (12918 left) root@DD-WRT:~# nvram show | grep port.vlans port5vlans=0 1 16 port3vlans=0 port1vlans=0 size: 19850 bytes (12918 left) port4vlans=0 port2vlans=0 port0vlans=1 root@DD-WRT:~# nvram show | grep vlan.hwname vlan1hwname=et0 size: 19850 bytes (12918 left) vlan0hwname=et0 root@DD-WRT:~# GUI Port 4 moved to WAN vlan root@DD-WRT:~# nvram show | grep vlan.ports vlan1ports=4 5 vlan0ports=3 2 1 0 5* size: 20005 bytes (12763 left) root@DD-WRT:~# nvram show | grep port.vlans port5vlans=0 1 16 port4vlans=1 18 19 port3vlans=0 18 19 port2vlans=0 18 19 port1vlans=0 18 19 port0vlans=1 18 19 size: 20005 bytes (12763 left) root@DD-WRT:~# nvram show | grep vlan.hwname vlan1hwname=et0 vlan0hwname=et0 size: 20005 bytes (12763 left) root@DD-WRT:~#

Pictures

DarkShadow's Unit

• 

  Top

• 

  Bottom

• 

  Board Top

• 

  Board Top 2

• 

  Bottom JTAG & Serial

• 

  Chips

• 

  JTAG & Serial

• 

  JTAG Bottom

FCCID Q87-WT54GV40

• 

  WRT54G v4 w/ 2 dBi Ant

• 

  WRT54G v4 w/ 2 dBi Ant

• 

  WRT54G v4 w/ 5 dBi Ant

• 

  WRT54G v4 w/ 5 dBi Ant

• 

  WRT54G v4 w/ 7 dBi Ant

• 

  WRT54G v4 w/ 7 dBi Ant

• 

  WRT54G v4 w/ 7 dBi Ant

• 

  WRT54G v4 w/ 7 dBi Ant

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54GS v3 w/ 2 dBi Ant

• 

  WRT54GS v3 w/ 2 dBi Ant

• 

  WRT54GS v3 w/ 5 dBi Ant

• 

  WRT54GS v3 w/ 5 dBi Ant

• 

  WRT54GS v3 w/ 7 dBi Ant

• 

  WRT54GS v3 w/ 7 dBi Ant

• 

  WRT54GS v3 w/ 7 dBi Ant

• 

  WRT54GS v3 w/ 7 dBi Ant

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54G v4

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  WRT54GS v3

• 

  2 dBi Ant

• 

  2 dBi Ant

• 

  5 dBi Ant

• 

  5 dBi Ant

• 

  7 dBi Ant

• 

  7 dBi Ant

• 

  7 dBi Ant

• 

  7 dBi Ant

• 

  7 dBi Ant

• 

  7 dBi Ant

• 

  7 dBi Ant

• 

  Model: D12-1A

• 

  Model: D12-1A

• 

  Model: D12-1A

• 

  Model: D12-1A

• 

  Model: D12-1A

• 

  Model: D12-1A

• 

  Model: AM-1201000D41

• 

  Model: AM-1201000D41

• 

  Model: AM-1201000D41

• 

  Model: AM-1201000D41

• 

  Model: AM-1201000D41

• 

  Model: AM-1201000D41

• 

  WRT54GS v3 Label

• 

  WRT54G v4 Label

• 

  Other Label

Notes

DD-WRT Troubleshooting

• If your router fails to reboot (power light doesn't stop flashing, no web interface, etc) you will need to Recover from a Bad Flash.