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Can't Register Serial Number on Gateway 828LM. Help!

I have a LiftMaster garage door opener and internet gateway 828LM. When I try to enter the serial number I get a message An Error has occured: The remote server returned an error: (500) Internal Server Error. Green and blue solid lights are on and it shows as a connected device on my NetGear router. What do I need to do to get this to work?
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    OK, I called customer service and they helped me fix the problem. Only solid green light should be on before adding any devices. I had to unplug gateway from power and from router. There is a small hole on the side of the gateway device. Using a paper clip, I held down the button inside the hole, then plugged device into the power outlet until a yellow light flashed. I was then able to plug the gateway into my router. At that point, only a solid green light came on. The serial number was then accepted by the computer and everything worked great.
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