Linksys WRT54G series

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The Linksys WRT54G (and variants WRT54GS, WRT54GL, and WRTSL54GS) is a Wi-Fi capable residential gateway from Linksys. The device is capable of sharing Internet connections among several computers via 802.3 Ethernet and 802.11b/g wireless data links. The firmware used in these units varies between versions.

Because they lack 802.11n, powerline networking, 5.8 GHz radios and gigabit Ethernet connections, these routers are no longer very popular for state of the art networks. However, some models remain extremely useful for those using third-party firmware, which is necessary to make full use of the radio power or other hardware capabilities these routers have. See third party firmware and compatibility notes for each model. Models that look identical and vary only by one minor version number are often quite different, so make note of the exact minor version.

Hardware and revisions

WRT54G

WRT54G version 2.0 with upgraded antennae

The original WRT54G was first released in December 2002. It has a 4+1 port network switch (the Internet/WAN port is part of the same internal network switch, but on a different VLAN). The devices have two removable antennas connected through Reverse Polarity TNC connectors. The WRT54GC router is an exception and has an internal antenna with optional external antenna. As a cost-cutting measure, the design of the latest version of the WRT54G no longer has detachable antennas or TNC connectors. Instead, version 8 routers simply route thin wires into antenna 'shells' eliminating the connector. As a result, Linksys HGA7T and similar external antennas are no longer compatible with this model. Until version 5 WRT54G shipped with Linux based firmware.

Version CPU RAM Flash memory S/N Prefix Power Notes 1.0 Broadcom BCM4702 @ 125 MHz 16 MB 4 MB CDF0 CDF1 5 V 2 A positive tip 20 front panel LEDs (including link/activity, collision detection and speed rating indicators for each Ethernet port). Wireless capability was provided by a Mini PCI card attached to the router motherboard 1.1 Broadcom BCM4710 @ 125 MHz 16 MB 4 MB CDF2 CDF3 12 V 1 A Front panel LEDs reduced to eight (one link/activity LED per port, plus one each for power, wireless, DMZ and WAN/Internet connectivity). Wireless chipset is integrated onto motherboard.

Note: some of the routers have BCM4702 CPU (http://www.dslreports.com/forum/remark,8985696)

2.0 Broadcom BCM4712 @ 200 MHz 16 MB 4 MB CDF5 Same as 1.1 with a CPU upgrade and greater wireless transmitter integration (fewer transmitter parts). Some of these have 32 MB of RAM but are locked to 16 MB in the firmware (can be unlocked to use all RAM — see (general info) and (for an XB card) and (for an XH card)). 2.1 Broadcom BCM4712 @ 216 MHz 16 MB 4 MB CDF6 Same physical appearance as 1.1 and 2.0 models. Some of these models have 32 MB of RAM installed but have been locked to 16 MB by the manufacturer. Some models have two 16 MB MIRA P2V28S40BTP memory chips. 2.2 Broadcom BCM4712 @ 216 MHz 16 MB 4 MB CDF7 Same physical appearance as 1.1 and 2.0 models. Switching chipsets from ADMtek 6996L to Broadcom BCM5325EKQM. Some of these models have 32 MB of RAM installed but have been locked to 16 MB by the manufacturer. Some models have 16 MB Hynix HY5DU281622ET-J memory chips. 3.0 Broadcom BCM4712 @ 216 MHz 16 MB 4 MB CDF8 Identical to 1.1 and later models, except for the CPU speed and an undocumented switch behind left front panel intended for use with a feature called "SecureEasySetup". 3.1 Broadcom BCM4712 @ 216 MHz 16 MB 4 MB CDF9 The Version 3.1 hardware is essentially the same as the Version 3.0 hardware. Adds "SecureEasySetup" button. 4.0 Broadcom BCM5352 @ 200 MHz 16 MB 4 MB CDFA Switched to new SoC 5.0 Broadcom BCM5352 @ 200 MHz 8 MB 2 MB CDFB 12 V 0.5 A Switched to VxWorks OS and reduced Flash Memory and RAM; not compatible with most third-party firmware, although the "VxWorks killer" utility allows some third-party open source firmware to be loaded. Since less physical RAM is available in this and future models, the third-party firmware (popular open source projects) were modified into special "micro" versions. 5.1 Broadcom BCM5352 @ 200 MHz 8 MB 2 MB CDFC 5.2 Broadcom BCM5352 @ 200 MHz 8 MB 2 MB CDFB 6.0 Broadcom BCM5352 @ 200 MHz 8 MB 2 MB CDFD Also based on VxWorks, will only run DD-WRT micro. VxWorks killer must be used prior to flashing, otherwise, it will refuse to flash. Due to low RAM, users may encounter issues when running P2P software. 7.0 Atheros AR2317 @ 240 MHz 8 MB 2 MB CDFE Switched to Atheros SoC 7.2 Broadcom BCM5354 @ 240 MHz 8 MB 2 MB CDFK Switched back to Broadcom based SoC; Samsung K4S641632K-UC75 (RAM); Samsung K801716UBC PI07 (Flash) 8.0 Broadcom BCM5354 @ 240 MHz 8 MB 2 MB CDFF CDFG Some units come with 16 MB of RAM. VxWorks killer works. Antennas cannot be removed. 8.1 Broadcom BCM5354 @ 240 MHz 8 MB 2 MB MDF0 FCC ID: Q87-WRT54GV81. OS is Linux, no need for VxWorks killer. Antennas cannot be removed. 8.2 Broadcom BCM5354 @ 240 MHz 8 MB 2 MB CDFJ FCC ID: Q87-WRT54GV82. VxWorks killer does not work. Antennas cannot be removed. WRT54GS

Linksys WRT54GS version 1.1

The WRT54GS is nearly identical to WRT54G except for additional RAM, flash memory, and SpeedBooster software. Versions 1 to 3 of this router have 8 MB of flash memory. Since most third parties' firmware only use up to 4 MB flash, a JFFS2-based read/write filesystem can be created and used on the remaining 4 MB free flash. This allows for greater flexibility of configurations and scripting, enabling this small router to both load-balance multiple ADSL lines (multi-homed) or to be run as a hardware layer-2 load balancer (with appropriate third party firmware).

Version CPU RAM Flash memory S/N Prefix Notes 1.0 Broadcom BCM4712 @ 200 MHz 32 MB 8 MB CGN0 CGN1 ADMtek 6996L switch. Added SpeedBooster technology (Broadcom Afterburner technology), claims to boost the throughput of 802.11g by 30% (for maximum boost needs SpeedBooster technology on the other side, but will boost standard 802.11g as well). Has LEDs for Power, DMZ, WLAN, Internet, and 1–4 Ports. 1.1 Broadcom BCM4712 @ 200 MHz 32 MB 8 MB CGN2 Switched to Broadcom BCM4712 SoC and BCM5325E switch. 2.0 Broadcom BCM4712 @ 216 MHz 32 MB 8 MB CGN3 10 LED Front Panel (two new ones behind Cisco logo button). Also capable of SecureEasySetup, but use of the logo button and lighting of the new LEDs behind it requires firmware upgrade. SoC chip REV1 or REV 2. The flash chip on this unit is Intel TE28F640. 2.1 Broadcom BCM4712 @ 216 MHz 32 MB 8 MB CGN4 Radio chip is changed from BCM2050 to BCM2050KML. 3.0 Broadcom BCM5352 @ 200 MHz 32 MB 8 MB CGN5 Switched to newer Broadcom SoC 4.0 Broadcom BCM5352 @ 200 MHz 16 MB 4 MB CGN6 Reduced RAM & Flash (a very rare few have 32 MB/8 MB) 5.0 Broadcom BCM5352 @ 200 MHz 16 MB 2 MB CGN7 Uses VxWorks OS and reduced Flash Memory; not compatible with most third-party firmware, although the "VxWorks killer" utility allows some third-party open source firmware to be loaded on this and future versions. 5.1 Broadcom BCM5352 @ 200 MHz 16 MB 2 MB CGN8 6.0 Broadcom BCM5352 @ 200 MHz 16 MB 2 MB CGN9 7.0 Broadcom BCM5354 @ 240 MHz 16 MB 2 MB CGNA CGNB CGNC Switched to newer Broadcom SoC. Newest VxWorks killer works. Antennas can be removed. CGNB and CGNC antennas can be removed. 7.2 Broadcom BCM5354 @ 240 MHz 16 MB 2 MB CGNE FCC ID: Q87-WRT54GSV72. Some antennas can be removed. Some refurbished ones have EN29LV160A 16 Mb (2 MiB) Flash and IS42S16800A or K4S281632IUC75 128 Mb (16MiB) RAM WRT54GL

Linksys WRT54GL version 1.1

Linksys released the WRT54GL in 2005 to support third-party firmware based on Linux, after the original WRT54G line was switched from Linux to VxWorks, starting with version 5. The WRT54GL is technically a reissue of the version 4 WRT54G. Cisco was sued by the FSF for copyright infringement, but the case was settled.

Version CPU RAM Flash memory S/N Prefix Notes 1.0 Broadcom BCM5352 @ 200 MHz 16 MB 4 MB CL7A New model line, released after the version 5 WRT54G, which returns to a Linux-based OS as opposed to the VxWorks firmware. SpeedBooster is not enabled in stock firmware, however third-party firmware will enable the feature. The hardware is essentially the same as the WRT54G version 4.0. One alteration is that the internal numbering scheme of the 4-port switch changed in this model, from 1 2 3 4, to 3 2 1 0. 1.1 Broadcom BCM5352 @ 200 MHz 16 MB 4 MB CL7B CL7C CF7C Detachable antennas. As of August, 2009, this version was shipping with firmware revision 4.30.11. This pre-loaded firmware allows the user to upload a 4 MB firmware image, whereas the pre-loaded firmware on version 1.0 limited the image to 3 MB. Firmware version 4.30.16 is now available for both hardware versions. Fully supported by Tomato, OpenWrt, and DD-WRT. WRTSL54GS

WRTSL54GS is similar to the WRT54GS while adding additional firmware features and a USB 2.0 port (referred to as StorageLink) which can be used for a USB hard disk or flash drive.

Unlike other models, the WRTSL54GS has only a single 1.5 dBi antenna, and it is not removable.

Version CPU speed RAM Flash memory S/N Prefix Notes 1.0 Broadcom BCM4704 @ 264 MHz 32 MB 8 MB CJK0 Released after the WRT54GS and WRT54GL. Uses Linux-based OS. Includes SpeedBooster support, additional firmware features, and an external USB 2.0 port (StorageLink) for network storage. Uses 8 MB of Intel TE28F640 flash with a Broadcom BCM4704 SoC and Broadcom BCM5325 Ethernet switch. 1.1 Broadcom BCM4704 @ 264 MHz 32 MB 8 MB CJK11 Change from SoC rev 8 to rev 9 (unconfirmed) WRT54GX

Linksys WRT54GX version 2

WRT54GX comes with SRX (Speed and Range eXpansion), which uses "True MIMO" technology. It has 3 antennas and was once marketed as a 'Pre-N' router, with 8 times the speed and 3 times the range over standard 802.11g routers.

Version CPU speed RAM Flash memory S/N Prefix Notes 1.0 Broadcom BCM4704 @ 266 MHz 16 MB 4 MB KBG5? Wireless-G Broadband Router with SRX. 2.0 Realtek RTL8651B @ 200 MHz 32 MB 8 MB KIO1? Wireless-G Broadband Router with SRX. WRT54GP2 and WRTP54G

WRT54GP2 has 1 or 2 antennas, and a built-in analog telephony adapter (ATA) with 2 phone lines, but only 3 network ports. "Vonage" WRTP54G has 1 antenna, 2 phone lines, 4 network ports — Same S/N Prefix

Version Locked to RAM Flash memory S/N Prefix Notes EA Engin 32 MB 8 MB CJJ0

CGZ0 on WRT54GP2

Wireless-G Broadband Router with 2 Phone Ports. Uses the Sipura Chipset WRT54GX2

WRT54GX2 has 2 antennas, and was advertised to have up to 6 times the speed and 2 times the range over standard 802.11g routers. Chipset Realtek. It is not compatible with DD-WRT .

WRT54GX4

WRT54GX4 has 3 moveable antennas, and is advertised to have 10 times the speed and 3 times the range of standard 802.11g routers. WRT54GX4-EU: chipset Realtek RTL8651B, radio chipset Airgo AGN303BB, flash S29GL064M90TFIR4. It does not appear to be compatible with DD-WRT .

WRT51AB

WRT series with 802.11a support. (First Generation)

Version CPU speed RAM Flash memory S/N Prefix Notes 1.0 Broadcom BCM4702 @ 125 MHz 32 MB 4 MB MCH0 2 mini-PCI Slots one A one B, Switch

BCM5325A

WRT55AG

WRT54G series with 802.11a support.

Version CPU speed RAM Flash memory S/N Prefix Notes 1.0 Broadcom BCM4710 @ 125 MHz 32 MB 4 MB MDJ0 2 mini-PCI Slots 2.0 Atheros AR5001AP @ 200 MHz 16 MB 4 MB MDJ1 WTR54GS

The Linksys WTR54GS is a confusingly named derivative of the WRT54G. It is a compact wireless travel router with SpeedBooster support that has only 1 LAN and 1 WAN Ethernet interfaces, but has 2 wireless interfaces. The WTR54GS has the ability to make an unencrypted wireless connection on one interface, and make open shared connections on the other wireless interface, or the LAN port. The default gateway IP address and default management address is 192.168.1.1.

Version CPU RAM Flash memory S/N Prefix JTAG port third-party firmware support Notes 1.0 Broadcom BCM5350 @ 200 MHz 16 MB (IC42S32400) 4 MB (29LV320ABTC) SJH0 yes DD-WRT v24 sp2 (mini or std) 2.0 Broadcom BCM5350 @ 200 MHz 8 MB 2 MB SJH1 no* DD-WRT v24 sp2 (micro only) *Some examples reportedly have a JTAG port, but most do not. 2.1 Broadcom BCM5350 @ 200 MHz 8 MB 2 MB SJH2 no DD-WRT v24 sp2 (micro only) WRT54G2

The WRT54G2 is an iteration of the WRT54G in a smaller, curved black case with internal antennas. This unit has a four port 10/100 switch and one WAN port.

Version CPU RAM Flash memory S/N Prefix Notes 1.0 Broadcom BCM5354 @ 240 MHz 16 MB 2 MB CSV Two non-replaceable internal antennas.

3rd-party firmware: Fully compatible with DD-WRT (micro, micro-plus, and micro-plus with SSH editions). Not compatible with Tomato and other third-party firmware solutions at this time.

Firmware: VxWorks

FCC ID: Q87-WRT54G2V1

1.1 Atheros AR2317 @ 180 MHz 16 MB 4 MB CSV Two non-replaceable internal antennas.

FCC ID: Q87-WRT54G2V11

3rd-party firmware: Supported by DD-WRT.

1.3 Broadcom BCM5354 @ 240 MHz 8 MB 2 MB CSV

Hardware: Reduced system memory to 8 MB.

3rd-party firmware: Supported by DD-WRT.

Firmware: VxWorks 5.5

FCC ID: Q87-WRT54G2V13

1.5 Atheros AR7240 @ 400 MHz 16 MB (W9412G6IH) 2 MB CSV

Hardware: Reduced to one internal antenna; switched from Broadcom to Atheros chipset (AR7240-AH1E + AR9285-AL1E http://www.atheros.com/pt/bulletins/AR9002AP-1SBulletin.pdf)

3rd-party firmware: Not possible with DD-WRT.

FCC ID: Q87-WRT54G2V15

* Note: 1.5 of the WRT54G2 is NOT supported by dd-wrt. Apparently it uses Atheros components that require more than the 2 MB of Flash Memory built-in for a dd-wrt solution.

WRT54GS2

The WRT54GS2 is the WRT54G2 hardware with the VxWorks 5.5 Firmware including SpeedBooster. It has a sleek black design with 2 internal antennas. It includes a 4-port 10/100 switch and one 10/100 WAN port on the rear.

Version CPU speed RAM Flash memory S/N Prefix Notes 1.0 Broadcom BCM5354 @ 240 MHz 8 MB 2 MB CUQ 3rd-party firmware: Fully compatible with DD-WRT (micro)*.

FCC ID:Q87-WRT54G2V1

WRT54GC

LinkSys WRT54GC V2.0 Compact Wireless-G Broadband Router.

WRT54GC series with 802.11b/g support. This unit has a four port 10/100 switch and one WAN port. The "C" in the router number stands for compact, as the unit measures 4" by 4" by 1" with an internal antenna. The unit can be expanded with addition of HGA7S external antenna to boost range. Hardware Version 1.0 is the only option available in the United States since introduction in 2005.

Version 2.0 is shipping in, amongst other countries, the United Kingdom. This unit has 1 MB flash, 4 MB RAM and a non-detachable external antenna.

The internal hardware is based on a Marvell ARM914 ("Libertas") reference design which is probably identical to the SerComm IP806SM, Xterasys XR-2407G, Abocom ARM914, Hawking HWGR54 Revision M, and the Airlink 101 AR315W. By appropriately changing the value of the firmware byte 0x26, the WRT54GC can be cross-flashed with firmware based on the same reference platform.

There were reports in 2006 that a sister platform of the WRT54GC (the AR315W) was hacked to run Linux.

WRT54G3G/WRT54G3GV2 Mobile Broadband router

A variant which has 4 Ethernet ports, 1 Internet Wired port (For DSL/Cable connections) plus a PCMCIA slot for use with a Cellular Based PC Card "aircard". The V2 model has an additional 2 USB ports for 3G modem use and 1 other USB port which has yet to be put to use.

Model Description Alternative Firmware WRT54G3G A Vodafone branded unit that comes with programmed settings for the Vodafone network supporting GPRS, UMTS and HSDPA. It can only accept the 3G PCMCIA cards and ExpressCards sold by Vodafone. It has no USB port to accept 3G USB dongles. The router can be use in other networks if the 3G cards are unlocked, because it is not the router, but the 3G cards that are locked to Vodafone. To use it in other networks it is necessary to change the settings of the APN, User and Password manually to those of the new network. It can also be unlocked by flashing EM/EU version firmware. With the latest firmware upgrade it supports full HSDPA up to 7.2 Mbit/s. Some of 3G cards that it supports, like the Huawei E800 and the Option GT Fusion, have external Antenna port to improve the reception of the 3G signals. Fully Supported by OpenWRT WRT54G3G-ST A Sprint Wireless (USA) unit which supports CDMA 1X and EVDO rev 0,A wireless Internet. Fully Supported by OpenWRT WRT54G3G-AT AT&T (USA) version of the router which supports GPRS and HSDPA(UMTS Maybe?) Fully Supported by OpenWRT WRT54G3G-EU European Union version supporting GPRS, UMTS and HSDPA. Fully Supported by OpenWRT WRT54G3GV2-VF A Vodafone branded unit which supports full HSDPA up to 7.2 Mbit/s and seems not to be locked to the Vodafone network (Via setting APN, User and Password manually) but does not work with all USB dongles (T-Mobile: Web'N-Walk-Stick III (Huawei 172) and IV (Huawei 176 – has ext. Antenna port) are well supported, out of the box. Huawei E220 is also supported – firmware upgrade maybe needed). Partial Supported by customization of Linksys GPL code and supported by OpenWRT. NOTE: Due to changes in the CFE (bootloader) it is not fully supported yet. You should not try it without a serial console.

Other Cellular Providers To use this router with other cellular providers, one must use an Alternative Firmware provider. The Stock Firmware does not support cellular providers, even though one does have the exact supported aircard. e.g.: Telus Mobility (CANADA) uses the Sierra Wireless Aircard 595 which is supported by this router, but because it is from Telus Mobility and not from Sprint (USA), it will never load the card into the router to make it operational. This is only true for the Sprint and AT&T branded models.

WRT54G-TM and WRTU54G-TM

Linksys WRT54G-TM

Linksys WRTU54G-TM

The WRT54G-TM (TM stands for T-Mobile) is also called the T-Mobile "Hotspot@Home" service. It allows calls to be made via T-Mobile's GSM network or via Wi-Fi Unlicensed Mobile Access (UMA), using the same telephone and phone number (a special dual-mode phone designed for the service is required e.g. Blackberry Pearl 8120). Additionally, once a call is in progress, one may transition from Wi-Fi to GSM (and vice versa) seamlessly, as Wi-Fi signal comes and goes, such as when entering or exiting a home or business. A special router is not needed to use the service, but the T-Mobile branded routers are supposed to enhance the telephone's battery life. This is the only known tweak to the TM version of the firmware. The hardware appears similar to that of the WRT54GL, except it has 32 MB RAM and 8 MB flash memory.

The WRT54G-TM having a serial number that starts with C061 has these specifications:

Broadcom BCM5352EKPBG CPU 32 MB RAM (Hynix HY5DU561622ETP-D43) 8 MB Flash (JS28f640) Uses the same BINs that the WRT54GS v3.0 does Model CPU speed RAM Flash memory S/N Prefix Notes

WRT54G-TM

Broadcom BCM5352 @ 200 MHz 32 MB 8 MB CO61 T-Mobile Edition WRT54GS V3.0 (Renamed WRT54G-TM). It is possible to upgrade to third-party firmware via JTAG or by replacing the CFS and uploading a new firmware over TFTP. Instructions for the CFS/TFTP method can be found easily on the Internet, and other third-party firmware can be easily applied afterwards.

The Tomato Firmware also works on the WRT54G-TM.

WRTU54G-TM

Infineon ADM8668 @ 200 MHz 64 MB 8 MB QMF00H T-Mobile Edition Model: WRTU54G-TM. This version has two RJ-11 telephone ports and two SIM card slots. The WRTU54G-TM is not supported by DD-WRT. It can be flashed, and work is being done to port OpenWRT to this board WRT54G-RG

The WRT54G-RG (RG stands for Rogers) is also called the Rogers TalkSpot Voice-Optimized Router. It works with Rogers' Talkspot UMA service, which allows calls to be made via Rogers' cellular network or via Wi-Fi Unlicensed Mobile Access (UMA), using the same telephone and phone number. A UMA-compatible phone is required. The WRT54G-RG and the WRT54G-TM are identical in terms of hardware.

Version CPU speed RAM Flash memory S/N Prefix Notes WRT54G-RG Broadcom BCM5352 @ 200 MHz 32 MB 8 MB CDF1 FCC ID: Q87-WT54GV40. The WRT54G-RG is supported by DD-WRT. WRT54GH

Linksys WRT54GH

The WRT54GH has a 4 port network switch and supports Wi-Fi 802.11b/g. It has only an internal antenna.

Third-party firmware projects

After Linksys was required to release the WRT54G's firmware source code under terms of the GNU General Public License, there have been many third party projects enhancing that code as well as some entirely new projects using the hardware in these devices. Three of the most widely used are DD-WRT, Tomato and OpenWrt.

Further information: List of wireless router firmware projects

Hardware versions affect firmware compatibility

As of January 2006, most third-party firmware is no longer compatible with version 5 of both the WRT54G and the WRT54GS. The amount of flash memory in the version 5 devices has been reduced to 2 MB, too small for current Linux-based third-party firmware. (See table above for information on identifying the version based on the serial number printed on the bottom of the unit, and on the outside of the shrink-wrapped retail box.)

Some users have succeeded in flashing and running a stripped down but fully functional version of DD-WRT called 'micro' on a version 5 WRT54G. An easier method not requiring any disassembly of the device has since been devised for flashing v5-v8 to DD-WRT.

To support third-party firmware, Linksys has re-released the WRT54G v4, under the new model name WRT54GL (the 'L' in this name allegedly stands for 'Linux'). It is also possible to replace the 2 MB flash chip in the WRT54G with a 4 MB flash chip. The Macronix International 29LV320BTC-90 is a suitable part although others may work as well. The user must first install a JTAG header and use a JTAG cable to back up the firmware, then replace the chip and restore the firmware with the JTAG cable. After testing for proper functionality of the modified unit, third-party firmware can be flashed using the JTAG cable and a suitable image file.

CPU

According to OpenWrt, the Linksys WRT54G series use several different processors, all of them 32-bit MIPS architecture processors, most manufactured by Broadcom.

Default settings

IP address: 192.168.1.1 (WRT54G-TM and WRT54G-RG: 192.168.0.1; WRTU54G-TM: 192.168.24.1) Web interface username: "admin" for most routers, no user name or "root" on some Password: "admin"

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