Reset TG1682G to original configuration

I had my new gateway installed yesterday and I tried to change the SSID and Password on “My-WiFi” for the 2.4Ghz tunnel.  I entered the new SSID and Password and it thought about it for about 2min and then timed out.  After rebooting my computer, I don’t see the 5Ghz tunnel anymore.  I see that the new SSID that I entered came up on the Wi-Fi list but neither the original password nor the new password works.  Is there a way to reset the gateway back to the original config?  The gateway is model: TG1682G.