CG3000D

I've been using the CG3000D for a while now. Unfortunately, it just doesn't have the range to get a signal to all the rooms in my house.  Since I have a WRN2000 that is capable of working as a bridge, I wanted to set it up to repeat the signal. The CG3000D doesn't show the option to allow it to connect to a bridge. Is there a way to update the CG3000D firmware so I can use it with the other router. It's very annoying to have a weak signal in a third of my house. Thanks for any help or ideas.