When upgrading NVR from v3.4.x to v4.x, please be sure NVR firmware is at v3.4.92 170518 firmware and perform system factory default before proceed upgrading NVR to v4.x. Failures have NVR at v3.4.92 and perform system factory default prior to upgrading NVR to v4.x could render NVR inoperable.
HDMI Output at up to 4K (3840 x 2160) Resolution
32-ch
32 IP Camera Inputs, 256 Mbps Bandwidth
Maximum Incoming/Outgoing Bandwidth: 256 Mbps
Independent HDMI and VGA Outputs