Download the correct file (e.g., rootfs-3536dv100 for version V1.7.4 ) and place it directly in the root directory of your USB drive—do not put it inside any folders.

Select the firmware file. The system will start the upgrade, which usually takes 5–6 minutes .

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: The specific update file for this model is typically named rootfs-3536dv100 . Pre-Update Requirements

Use a USB drive (FAT32 format is recommended) and ensure it is empty.

: If the update fails, check if the file name was altered (e.g., rootfs-3536dv100(1) ) or if you are using a USB 3.0 drive, which can sometimes be incompatible.

Follow these steps carefully. Ensure your NVR is connected to a reliable power source during this process.

Redownload the package from the Zosi Help Center and try a different USB port. Wrong system ID file chosen