dell_rah,
I may be wrong, but I used to own a Dell 964 Printer and it used a USB Cable to print. Not sure how an Ehternet cable works on this model.
I used to recommend firmware upgrades, until a firmware went wrong, then the person blamed me, so I removed all the posts with firmware in them. The printer has top be able to communicate, print, then the firmware can be applied. If the printer is not communicating, then the firmware will not install.
Rick