WRT54GS "Router Not Supported".

Question

Hello.  I have a WRT54GS V.6.  I have had it for quite a long time, but just yesterday it stopped giving internet to its wired connection.  The wireless connection was working fine.  I reset the router (holding the button in for thirty seconds and planned on making a new network). Everytime now it tells me: "Router Not Supported".  I looked around the support here, and ended up downloading the firmware upgrade and upgraded the router, reset it once again, and tried once more.  Same problem.  "Router Not Supported".  The power light is on.  The WLAN light is on, the Ethernet Port 1 light is on, and the Internet light is blinking.  So it IS recieving the signals.  I don't understand what's wrong.  I have no internet connectivity through the router, either.
Can someone help me?

Answer 1

Further browsing of the forums, and I came across this:
 Step 1 : You should just connect the router to main wired computer from ( port 1,2,3,4). No need to connect the dsl modem in this step .
Step 2 : hard reset the router It seems that we will have to reset the device back to the factory defaults. Kindly follow these steps to reset the device:- - While the device is 'ON', press the reset button on the back panel of the device using a pointed object and keep it held for about 60 seconds. - You will notice that the power light on the device would start blinking, indicating that it is being reset. - After 60 seconds release the reset button and switch 'OFF' the Linksys device and wait for 10 seconds and then switch it 'ON' again. - Let the power light on the device stabilize.
Step 3 : wireless settings. Please access the setup page of the router by launching an Internet Explorer and type on the address bar, 192.168.1.1 and press enter. When it prompts for the username and password, leave the username field empty and provide password as admin all in lower cases and then click on ok. Click on the Wireless tab - Here Wireless Network mode should be mixed - Provide any new name in the Wireless Network Name (SSID) box, all in lower cases without any spaces in between. Do not use any old name - Set wireless channel to 11 - And wireless SSID broadcast should be Enabled and then click on save settings.
Step 4 : wireless security
1. When the router's setup page appears, please click on the Wireless tab.
2. When the Wireless area appears, click on the Wireless Security sub tab.
3. When the Wireless Security area appears, select WEP under Security Mode dropdown.
4. Encryption should be set to 64 bits 10 hex digits.
5. Skip the Passphrase box.
6. In the WEP Key1 box, type in a phone number (just the numbers no spaces or dashes) that you can remember in the box.
7. Make a note of these 10 numbers; this would be your wireless network's key.
8. Leave the key 2, key 3 and key 4 boxes blank, and then click on the Save Settings button.
Step 5 : On the 192.168.1.1 set up page of the router , please click on the set up tab . In that you will find an option as local ip address 192.168.1.1 . Please change that to 10.10.10.1 and then hit save settings at the bottom. Once setting's are saved close that page.
Step 6 : confirmation of the physical connection. You should connected the modem router ( internet port ) to main wired computer ( port 1,2,3,4). Now switch OFF both your modem and the router. Switch ON the modem first and wait for about 40 seconds and only then switch on router. At the end of the step 6 try going online from the wired computer . If you are not able to go online from the wired computer than do the step 7
Step 7 : Please access the setup page of the router by launching an Internet Explorer and type on the address bar, 10.10.10.1 and press enter. When it prompts for the username and password, leave the username field empty and provide password as admin all in lower cases and then click on ok. On the main setup page select the Internet Connection Type as PPPoE. - Then provide the username and password provided by your ISP (Internet service provider) for your connection. (Example: [email protected]) - For MTU select Manual from the drop down box and set the MTU size to 1250. - Select the Keep Alive option and choose the redial period as 30 sec 
(Originally in BTB's post)
And it worked for me. :]  So my problem is solved.