NVR from the official Hikvision EU Download Portal or the global support site. This model belongs to the family of network video recorders. Official Download Sources
Hikvision firmware is region-locked. If you have a device purchased in North America and you install firmware meant for the Chinese market (or sometimes Europe), you will "brick" the device (it will stop working and cannot be easily fixed). ds-7716ni-e4/16p firmware download
You can download the firmware for the Hikvision DS-7716NI-E4/16P NVR from the official Hikvision EU Download Portal
: Go to Maintenance > Upgrade and browse for the extracted file. ds-7716ni-e4/16p firmware download