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Linksys WRT54G v4.0

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Linksys WRT54G v4

Manuf/OEM/ODM CyberTAN

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

Local image
Linksys WRT54G-02.jpg

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


Stock bootloader: CFE

Stock FW OS: Linux

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

Default SSID: linksys (51 addl. devices)
Default IP address:
the IP is used by 1043 additional devices
of which 140 are Linksys devices
Default login user: blank
Default login password: admin
blank:admin credentials used by 269 additional devices
of which 139 are Linksys devices

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

Linksys WRT54G-RGQ87-WT54GV40
Linksys WRT54G-TMQ87-WT54GV40
Linksys WRT54GL v1.0Q87-WT54GV40
Linksys WRT54GL v1.1Q87-WT54GV40
Linksys WRT54GS v3Q87-WT54GV40
Linksys WRT54GS v4Q87-WT54GV40
Linksys WRT54GS v5.0Q87-WT54GV40
Linksys WRT54GS v5.1Q87-WT54GV40
 CPU1 brandWI1 chip1 brandWI1 chip2 brand
Linksys WRT54G v1.0BroadcomBroadcomBroadcom
Linksys WRT54G v1.1BroadcomBroadcomBroadcom
Linksys WRT54G v2.0BroadcomBroadcomBroadcom
Linksys WRT54G v2.2BroadcomBroadcomBroadcom
Linksys WRT54G v3.0BroadcomBroadcomBroadcom
Linksys WRT54G v3.1BroadcomBroadcomBroadcom
Linksys WRT54G v4.0BroadcomBroadcomBroadcom
Linksys WRT54G v5BroadcomBroadcomBroadcom
Linksys WRT54G v5.0BroadcomBroadcomBroadcom
Linksys WRT54G v6.0BroadcomBroadcomBroadcom
Linksys WRT54G v7.0AtherosAtheros
Linksys WRT54G v7.2BroadcomBroadcom
Linksys WRT54G v8.0BroadcomBroadcom
Linksys WRT54G v8.1BroadcomBroadcom
Linksys WRT54G v8.2BroadcomBroadcom
Linksys WRT54GHRalinkRalink
For a list of all currently documented Broadcom chipsets with specifications, see Broadcom.

Wireless-G Broadband Router

 • Support page • Downloads (US)

Links of Interest[edit]


Flashing DD-WRT[edit]


Flashing OpenWrt[edit]

Flashing Gargoyle[edit]

Flashing Tomato[edit]



Reverting to OEM Firmware from DD-WRT[edit]

JTAG-Serial Info[edit]


JTAG Pinouts[edit]

 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[edit]

USB Info[edit]


vlan Info[edit]

DD-WRT vlan Info[edit]


"/proc/switch/eth0" exists

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


DarkShadow's Unit


DD-WRT Troubleshooting[edit]

  • 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.