You can refer to this picture below to check system current firmware version and release date. After upgrading, you can also check if build date changed.
1. Please copy the firmware file to a USB disk.
DON'T UNZIP IT and DON'T try to open it with any software.
2. Please insert USB hard drive to the USB port of recorder.
3. Please refer to this picture below to upgrade.
It will reboot after upgrading.