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Important Linksys Router Troubleshooting Tips

Linksys WRT54G, WRT54GS & WRT54GL Antenna setup: When using the Super Cantenna with Linksys routers, you must set your Antenna Selection option within the router settings to use either the left or right antenna.

The antenna selection option is located within the Advanced Wireless Settings tab in most versions of Linksys routers. However, if your particular Linksys router does not include this option, you can upgrade your router's firmware to enable antenna selection by following these steps:

Step 1: Determine the current Model and Version of your Linksys router. The Model number is located on the front and bottom of the router (eg: WRT54GS). The Version number is located on the bottom of the router above the serial number (eg: WRT54GS v1.1).

Step 2:
Download the correct firmware upgrade depending on your Model and Version #. Click on correct link below and Save to your desktop. Unzip the file.

Model: Serial number
Upgrade from
stock firmware:
WRT54G v1-v4 CDF0-CDF9,CDFA Download
WRT54GL CL7A Download
WRT54GS v1-v3 CGN0-CGN5 Download
WRT54GS v4 CGN6 Download
WRTSL54GS CJK0 Download
WRT54G v5.0-7.0 CDFB, CDFC,CDFD,CDFE *see below
WRT54G v8 CDFF, CDFG Antennas cannot be removed! NOT COMPATIBLE
WRT54GS v5.0-6.0 CGN7, CGN8, CGN9 *see below

Step 3:
Go to and enter your username and password (default is admin/admin).

Go to Administration—>Firmware Upgrade, browse to the .bin file on your desktop and flash it.

DO NOT interrupt the flashing process and patiently wait until the router has rebooted.

Step 4: Go to Wireless—>Advanced Wireless,
Set both the TX (transmit) and RX (receive) pull down menus to the left or right antenna.

LINKSYS WRT54G & WRT54GS (version 5.0 to 7.0) - The firmware on version 5.0 to 7.0 is not upgradeable at this time. In order to use your Super Cantenna with these versions, you must REMOVE BOTH ANTENNAS AND CONNECT THE CANTENNA TO THE RIGHT CONNECTOR WHEN LOOKING AT THE REAR OF THE ROUTER.

Some recommendations:

  • Avoid upgrading over a wireless connection since they can drop out.
  • If you're using DHCP on your computer, renew the lease early or reboot your computer to make sure it doesn't try to renew (and possibly unbind) in the middle of the upgrade. In Windows, you can renew the lease by running "ipconfig /renew".
  • Do not hit stop, or navigate away from the upgrade page. Do not reboot, or unplug the router. Do not do anything to interrupt the upgrade or you may end up with a dead brick.
  • It will take a few minutes for the firmware to upload. Upload progress bars are based on time, not the amount of data uploaded so don't worry if it goes past 100% and loops back again, or if it doesn't reach 100% at all.

    Once the upgrade is finished, you will see a page indicating the result and then router will reboot on its own. If the page appears broken or empty, wait for one minute, make sure the router doesn't have a flashing diag or power light, then load manually.
  • If you upgraded from a different firmware, erase any left over settings and restore the defaults by going to Administration:Factory Defaults and choosing Clear NVRAM. Manually re-enter the settings, do not use the Restore feature.
  • If for any reason a firmware upgrade fails, you have to reboot the router before trying again.

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