How to upgrade the firmware of DVR-462/DVR-872 /DVR-1672?

You can use the USB flash to upgrade firmware. The upgrade process as following.
Step 1: Please save the firmware file into your USB flash disk.
Step 2: Please plug the USB flash disk into the USB port on DVR.
Step 3: Login the OSD menu of DVR, and enter to "Utility Setup" page.
Step 4: Select "Upgrade" option and browse the firmware file from your USB flash disk.
Step 5: Start to upgrade firmware and the system will reboot automatically when the upgrade is completed.

Note
1. Please stop recording and backup setup configuration before upgrading.
2. DO NOT TURN OFF POWER OR UNPLUG USB DEVICE DURING THE UPGRADE as it may cause incomplete firmware upgrade and damage to the DVR.