Please review the below steps in applying the firmware included on this page.
Step 1 - Download the file to a temporary location on your PC.
Step 2 - Extract the "bin" file from the zip archive onto a USB flash drive that has been formatted using FAT-32.
Step3 (Newer GUI Interface) - Insert the USB flash drive into your NVR/DVR and go to Main Menu > select System within the Settings row > and select the Upgrade option. Choose the "bin" file from the USB drive and click Start to apply the update.
Step3 (Older GUI Interface) - Insert the USB flash drive into your NVR/DVR and go to Main Menu > Info > Version and select the Start option to apply the update. You may need to rename the file to "Update.bin".