Actiontec produced a retail version of this device and currently the only firmware available for the retail version is the one the that is was releases with. If you subscribe to this article you will be notified be email when an update has been released.
Actiontec also made this device for several different ISP's (internet Service Providers) and those ISP have asked us not to post those firmware version on our website. So we do apologize but you will have to contact the ISP who supplied you the device for any firmware upgrades. If you purchased this device from another source, you should be able to locate the name of the ISP that the device was made for. At that point you can go to there support website to locate any firmware upgrades they might have.
If you are still having troubles drop us a note in the comments below and we will do our best to supply you with the correct website.