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The Linksys site mentions 'Management Mode' which makes it trivial to recover from bad flashing (answer id 3176). Here's how to do it:
1. Unplug the power cord from the back of the router.
2. Hold down the Reset button.
3. While holding down the Reset button, plug back in the power cord to the router.
4. Continue to hold the Reset button for five (5) seconds. After five (5) seconds, release the button.
5. Wait for about one (1) minute. Then, on a computer connected to the router, launch a web browser (for example, Internet Explorer or Mozilla Firefox).
6. Type in the router's IP address of http://192.168.1.1 into the Address field and press the [Enter] key.
7. The Management Mode - Firmware Upgrade interface should appear.
Dále:
Linksys WRT54 GL:
Linksys wrt54 GL users please note that if flashing with tftp using dd-wrt firmware gives no results, original Linksys firmware from www.linksys.com is worth trying. If that works, do a hard reset and you can continue to flash with dd-wrt. In order to use the Standard firmware version, a MINI version MUST be used first.
Notes:
* The -i specifies binary transfer mode. The transfer will fail if you don't specify this.
* Start the command and then power up the router. There is no indication of any transfer until it is complete.
* The uploading via this command is pretty slow ~5.7kB/s if you are using 10Mbps half duplex mode so it will take about 10 minutes to upload ~3MB image. When you're using 100Mbps full duplex mode, it will go much faster. After the transfer is complete, wait 2-3 minutes for the image to be written to flash.
* If TFTP does not work, try changing your network adapter to 10 Mbps half duplex.
* Provided you have followed these steps correctly you should notice that the router will eventually reboot, in some cases it will require a power cycle (however if you power cycle wait at least 10 minutes to be sure the flash writing has occurred before you pull the plug).
* Enjoy the fact that you did not waste $60 and that your router is now functioning again.
ZÁKLADEM JE TRPĚLIVOST!!