Tras una larga pelea para cambiar el firmware de mi router, finalmente lo he conseguido. La información la he conseguido de (http://www.dd-wrt.com/wiki/index.php/Linksys_WRT54G_v5.0_%26_5.1_%26_6.0) y la copio al final. Simplemente comentar que a los archivos que pide bajarse en el punto 1 he tenido que sobreescribir los archivos que se usan en los puntos 13 y 20.3. Esto ha sido porque los que viene con el zip bajado ponían que no eran los archivos correctos. Los archivos correctos los he conseguido en http://www.dd-wrt.com/site/support/router-database buscando mi modelo y versión (v5.0)
http://www.dd-wrt.com/routerdb/de/download/Linksys/WRT54GS/v5.0%20/%20v5.1/vxworks_prep_gs_v03.zip/2118
http://www.dd-wrt.com/routerdb/de/download/Linksys/WRT54GS/v5.0%20/%20v5.1/dd-wrt.v24_micro_generic.bin/1959

Otro problema ha sido averiguar la versión de firmware que tenía. El router no tenía las pegatinas que lo indicaban y no he tenido forma de averiguarlo. Por suerte, al intentar cargar los firmwares de linksys sólo me ha ido bien con los de la versión 5.0 y 6.0, así que he deducido que era una de estas dos versiones.

El proceso aquí descrito a mi me ha ido bien, partiendo de la última versión de firmware propietario existente (1.5.x). También comentar que después de los hards resets no he esperado hasta que hayan dejado de parpadear las luces, simplemente un tiempo grande prudencial. Tuve el router toda la noche esperando a que dejara de parpadear y no dejó, así que supuse que en este modelo no dejaban de parpadear después de un hardreset (arriesgado :s)

Linksys WRT54G v5.0 & 5.1 & 6.0

From DD-WRT Wiki

[edit] How To Flash

NOTE: During configuration or flashing a router, the only thing that should be hooked to the router is the computer through the ethernet cable, and power.

IN SPITE OF SOME OTHER INSTRUCTIONS ELSEWHERE, YOU REALLY NEED TO CREATE A CUSTOM VX Image for your router. If you don’t you will get a generic MAC address on your router and a generic MAC address will mean most ISP won’t let you connect to the Internet. Here is how to do it properly:

1. Go to this thread and download the zipped files in GV5Flash.zip: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=58231
2. Read the peacock announcement found here: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486
3. Do a HARD reset on the router according to note 1 of the peacock announcement (30/30/30)
4. Set a static IP on your computer to 192.168.1.7. Subnet mask should be 255.255.255.0.
5. 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.
6. Unzip the file you downloaded in step one, and place it in a location you can easily find on your computer.
7. Unzip the VXImgToolGui.zip file to the same folder as where you placed the other files you downloaded.
8. Start VXImgToolGui.exe.
   1. Make sure the top button is on the left for WRT54G, not the right for WRT54GS.
   2. Put the MAC address from the bottom of your router in the box that says “Desired MAC”.
   3. Click on the three dots next to “output image” and save the file as My54gImage.bin in the same folder as everything else is located.
9. Power cycle the router (unplug the power from the router for 30 seconds and then plug it back in).
10. 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.
11. Enter “root” as the username and “admin” as the password.
12. Go to Administration and Firmware Upgrade.
13. Navigate to the folder that you are using, and select vxworks_prep_03.bin.
14. Hit upgrade.
15. Wait for FIVE FULL MINUTES. Go for a walk. Don’t you TOUCH that router for FIVE MINUTES.
16. When five full Earth minutes have passed, power cycle the router.
17. Refresh your browser window. If you get a blank window, clear your browser cache. NOW you should be in the MANAGEMENT MODE window.
18. Select the My54gImage.bin file that you created. Hit Apply.
19. Wait for the “Upgrade Success” message, and then WAIT FIVE FULL MINUTES again. Don’t TOUCH your router.
20. Start tftp.exe.
    1. Enter 192.168.1.1 as the address in the top box of tftp.exe.
    2. Leave the password blank.
    3. Select the 12548 Newd_Micro.bin firmware.
    4. Set retries to 99.
    5. Power cycle the router.
    6. Count to 2.
    7. Hit upgrade.
21. When you get a success, wait FIVE FULL minutes.
22. If you don’t get success, repeat from steps 19(4) 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.
23. When you can access the dd-wrt webgui using a browser at 192.168.1.1, power cycle the router.
24. When you can again access the dd-wrt webgui using a browser at 192.168.1.1, do another HARD reset on the router.
25. Reset your computer Ethernet connection to auto IP and auto DNS.

[edit] Other Notes

Also see this page: Version 5 And 6 Router Information

There is good information at the scorpiontek site: http://www.scorpiontek.org/portal/content/view/27/36

A CFE compressor is available for the Gv5.0,5.1, and 6.0. It enables micro_plus to be put on the router. Click here.

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