To get the exact model of your unit, check this article: Where to get the model number?
Click the link below to download the manual.
NVR - (8580, 8580RN, 8780, 8780RN)
Wizard Quick Start Guide - First time setup for all recorders listed above
Hardware Quick Start Guide - This Hardware manual or Hardware QSG is to show you how to set up your recorder to your cameras, TV, router, etc for first-time setup.