Information About Management Mode for Firmware Recovery

I think you can try upgrading the firmware on your router,

Connect the computer to the router.
Download the latest firmware.
Open the setup page of the router and upgrade the firmware.
After upgrading the firmware, reset the router and reconfigure it manually.

See How to upgrade firmware on Linksys router.

Watch video: Linksys router setup

NOTE: Image may vary depending on the type of router and computer you are using.
To setup your router's wireless security settings:
i. Accessing the web-based setup page
ii. Setting-Up the Wireless Security
Accessing the web-based setup page

Step 1:
Access the router's web-based setup page by opening a web browser. On the Address bar, enter your router's local IP address then press [Enter].

NOTE: The default IP Address of Linksys routers is "192.168.1.1". For instructions on accessing the web-based setup page using a Mac computer, click here.

Step 2:
When the login prompt appears, enter your router's Username and Password.

NOTE: The default password is "admin" and the Username field is left blank. If you have set a password before but forgot it, you need to reset the device. For instructions on how to reset a Linksys router, click here.

Step 3:
On the Setup page, click the Wireless > Wireless Security.

NOTE: If some of the tabs are missing in the web-based setup page, upgrade the firmware of your router. For instructions, click here. You can also set the wireless security of your Linksys E-Series routers with Cisco Connect. To learn how, click here.

On the Wireless Security sub-tab, there are various wireless security options that you can choose from.

However, as mentioned earlier, the three most commonly used security modes are WEP, WPA Personal (or WPA Pre-Shared Key), and WPA2 Personal. The instructions below will show you how to set up the following security modes. On the other hand, the WPA2/WPA Enterprise Mixed Mode, WPA Enterprise, WPA2 Enterprise, and RADIUS security modes will only work if the router is connected to a RADIUS server.
Setting-Up the Wireless Security

Wired Equivalent Privacy (WEP)

WEP can be a 64-bit key with 10 hexadecimal digits or a 128-bit key with 26 hexadecimal digits. This encryption will prevent other users from connecting to your wireless network. It will also protect your wireless transmissions from being accessed by other users.

NOTE: In case the screen on your router's web-based setup page looks different, click here.

Step 1:
On Security Mode, select WEP.

Step 2:
Under WEP Encryption, select 40 / 64-bit (10 hex digits) and enter a unique word in the Passphrase field.

NOTE: The 128-bit key uses a higher level of encryption compared to the 64 bit WEP. It uses a 104 bit (26 Hex Character).

Step 3:
Click the Generate button and copy the string of letters and numbers displayed in the space provided for Key 1. The Key 1 contains the wireless password.

NOTE: You can also create your own Wireless Password (Key 1) given that it is in hexadecimal format. The hexadecimal system consists of the characters 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E, and F. You can only choose 10 characters (in any given order) from that set.

Step 4:
Click .

Wi-Fi Protected Access (WPA)

Wi-Fi Protected Access (WPA) is a Wi-Fi standard designed to improve the security features of WEP. WPA is stronger than WEP encryption. PSK and PSK2, the two types of WPA, give you a choice between two encryption methods: the Temporal Key Integrity Protocol (TKIP), which incorporates Message Integrity Code (MIC) to provide protection against hackers, and Advanced Encryption System (AES), which utilizes a symmetric 128-Bit block data encryption.

NOTE: For older versions of Linksys routers, WPA Personal is also referred to as WPA Pre-Shared Key. Refer to the image below for an example.

To set up WPA Personal on a Linksys router, follow the steps below:

Step 1:
On Security Mode, select WPA Personal.

NOTE: If you are unable to find the WPA Personal or WPA2 Personal in the list of choices for the Security Mode then you might need to upgrade the firmware of your router to its latest version. Upgrading the firmware can fix the bugs of the previous version and update its other features.

Step 2:
Enter your Passphrase.

NOTE: The Passphrase must consist of at least eight characters and is case-sensitive.

Step 3:

Click .

Something went wrong during the upgrade of your firmware. If you were upgrading the firmware from Linksys website you need to call their tech support and have them replace it for you. If you were trying to hack it with a 3rd party firmware you probably need to go buy another one and maybe consider using the firmware it comes with. You cannot restore the device because the flash killed the restore function. Your device is cooked. Put some BBQ sauce on it and serve it for dinner.

Try to upgrade the firmware of the router and reduce the MTU settings on the router.
Click Here for more info

  If the Power LED on your Linksys router is blinking, this means the firmware is corrupted. Since the firmware is corrupted, you won’t be able to access the web-based set up page of the router. Instead, you will be using tftp.exe to update the firmware. We recommend that you perform the following procedure in a Windows-based computer.
Downloading the Firmware

Follow the procedure here:

http://linksys.custhelp.com/cgi-bin/linksys.cfg/php/enduser/std_adp.php?p_faqid=3703&p_created=1151556377&p_sid=7FfWNnGj&p_accessibility=0&p_redirect=&p_lva=19073&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9Mjc3OSwyNzc5JnBfcHJvZHM9MCZwX2NhdHM9MTcyMSwxNzIzJnBfcHY9JnBfY3Y9Mi4xNzIzJnBfcGFnZT0xJnBfc2VhcmNoX3RleHQ9cmVzZXR0aW5nIHRoZSByb3V0ZXI*&p_li=&p_topview=1

Yes you can upgraded that, you ne3ed to go to http://linksys.com/download and then select the model number of your router and download the firmware and install it, there is also steps on how you upgrade it on the web site

You should have tried the followings to eliminate some possibilities:

* Hard reset your router by using a niddle or something to press the botton on the back or underneath of your router.

* Use another laptop or desktop to access the management interface, see if it's getting better, or back to normal

* If you familiar with the Terminal funciton in windows system, you can revive your router even you got it bricked by upgrade the firmware.

Unfortunately, a failed firmware upgrade is the one thing you can't recover from. The only reset available on these devices is just going back to the original factory configuration. If the base software itself has been corrupted, then I'm afraid there is no way to recover. If the device is still under warranty, contact the vendor to arrange a replacement, or bring it back to the store from which you purchased it.

I have update the fireware of linksys router WRT54G ver.2.2 by wireless.. Wrong move.. Then it stop loading.. now I can not get in to the router even i reset the router.. what can i do to have it back..

To resolve this problem, you will need to upgrade your router's firmware. Click ftp://ftp.linksys.com/pub/network/befw11s4_v4_v1.50.14_code.bin and download the file to your Desktop or My Documents folder (the link is to v1.50.14 firmware code). Once the BIN file has been downloaded, follow these instructions to upgrade the router's firmware: NOTE: Before upgrading your router's firmware, please make sure that the procedure is being performed by a computer that is connected directly to the Router with an Ethernet cable and not a wirelessly connected computer. Accessing the Router's Setup Page 1. Open a web browser such as Internet Explorer or Netscape. 2. When the browser window opens, go to the Address bar and type in the router's IP Address and click on the Go button (192.168.1.1 is the default IP address of Linksys Routers). 3. A window will appear prompting for a ?User Name? and a ?Password?. Leave the ?User Name? field blank, and type in the router's password and click on the OK button to login (admin is the default password). 4. The router's web-based ?Setup? utility should then load. Upgrading the Router From the router?s ?Setup? page, locate the Linksys logo in the upper left-hand corner of the page. Follow the instructions below depending on which logo matches your specific screen: If the logo matches the image above ("Linksys - A Division of Cisco Systems, Inc."), follow these steps. If not, skip to the next logo version. 1. Click on the Administration tab. 2. When the ?Administration? page loads, click on the Firmware Upgrade sub-tab. 3. When the ?Upgrade Firmware? page loads, click on the Browse button, and browse to the location where the firmware file was downloaded (and possibly extracted) to. 4. After browsing to the correct location, select the firmware file and click on the OK button. 5. Click on the Upgrade button to upgrade the router's firmware. If the logo matches the image above ("Linksys"), follow these steps: 1. Click on the Help tab. 2. When the "Help" page loads, click on the Upgrade Firmware link. 3. When the ?Upgrade Firmware? page loads, click on the Browse button, and browse to the location where the firmware file was downloaded (and possibly extracted) to. 4. After browsing to the correct location, select the firmware file and click on the OK button. 5. Click on the Upgrade button to upgrade the router's firmware. After completing the steps above, the router's firmware should be upgraded successfully.