can't upgrade firmware

Hi,

I proudly own a WL300g router wich I'm now using to connect to a adsl ethernet modem.

My firmware version is 1.8.19, and since the connection is having too much idle disconnect timeout problems, I was willing to upgrade my firmware version.

The only big problem I have is that I can't upgrade my firmware, I'm trying to do it from my setup site, but firefox get's a problem: Document contains no data and IE says that the server is no longer found.

Anyone can help me?

Thank you in advance.
Jean