First of all, send your current version to the support for upgrade file.
- format the USB flash drive to FAT 32
- copy the "upgrade file" into U-Disk's root directory.
- Insert the USB flash drive into the USB port of the NVR / DVR
- Right click screen---Main menu---Advanced---Upgrade
- Please download DeviceManage tool
- Unzip the tool and open it (connect your NVR to internet)