If the screen remains black after a failed firmware update:
Do not power off the DVR during the update. The device will reboot automatically after 3-5 minutes. Hikvision Ds-7b16huhi-k2 Firmware Download
There are three main ways to apply the update once you have the file: Copy the digicap.dav file to a formatted USB flash drive. Plug the USB into the DVR. Go to Main Menu > Maintenance > Upgrade . If the screen remains black after a failed