WRTN300 wireless security resetting

I have enabled my routers Wireless Security mode (WEP), configured the clients to use the key and all is well. Then a day or so later the Router mysteriously resets and the SSID goes back to LinkSys_Safexxx and the keys are gone. Clients fail.
I have downloaded the latest firmware (WRT300N-v1.1_1.51.2) but at 6% it gives a 'Firmware upgrade Failed' message. I have a WRT300N v1, the download only offers 1.1 & 2.0. Non-wireless functionality on the router still works.
For now I have disabled the Wireless Security but the resetting is still occuring. I have restored to Factory Settings to see if this stops the reset.
Any ideas?
Thanks in advance Brent
Solved!
Go to Solution.

Download the router's firmware from here
Follow these steps to upgrade the firmware on the device : -
Open an Internet Explorer browser page on a computer hard wired to the router...
In the address bar type - 192.168.1.1...Leave the username blank & in password use admin in lower case...
Click on the 'Administration' tab- Then click on the 'Firmware Upgrade' sub tab- Here click on 'Browse' and browse the .bin firmware file and click on "Upgrade"...
Wait for few seconds until it shows that "Upgrade is successful"  After the firmware upgrade, click on "Reboot" and you will be returned back to the same page OR it will say "Page cannot be displayed".
Now reset your router :
Press and hold the reset button for 30 seconds...Release the reset button...Unplug the power cable from your router, wait for 30 seconds and re-connect the power cable...Now re-configure your router...See if this resolves your concern...

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