This upgrade file works for the MPH08T4 and NPH08T4.
You can find your DVR's model number on the label at the bottom of your NVR.
(1). Attach is the upgrade files, after you download the files, please save the upgrade files rootfs-3520dv400 in the root directory, not save it under any other folders.
(2). You needn't open the files, please directly download the upgrade file and save it to your U-disk.
Note: it is better to use a 16GB or smaller flash drive with a Fat32 format.
(3). The files' name should be rootfs-3520dv400 , can not be have any changes,
if the files' name change to rootfs-3520dv400(1), the upgrade will be failed.
(4). Before starting to upgrade, please remove the mouse and unplug the power supply,
then plug the U-disk into the DVR's USB port, and plug the power supply.
(5). It can upgrade automatically as long as it has electricity, the upgrade process need
to last several minutes, please be patient.
After upgraded, Please go to the DVR’s main menu – information – System to check the version.
If the upgrade was failed, we suggest you change another U-disk or USB port to try.
If the upgrade is successful, you can change the channel name and set the WIFI function.
Please don't worry, if this can't help you, please feel free to contact us.