| Error Message | Solution | | :--- | :--- | | "Device type mismatch" | You downloaded V402R11 for NVR but have a DVR. | | "Update package is invalid" | Re-format USB to FAT32 (not exFAT/NTFS). | | "Language mismatch" | Your recorder is a Chinese grey-market unit. Do not flash English firmware. |
Manual updates are typically performed via a USB flash drive. V4.02.R11 H.264/H.265 DVR/NVR Firmware Download v402r11 h264 h265 dvr nvr firmware download high quality
Downloading the wrong firmware can "brick" your device (render it unusable). You must match the embedded in your current version string. Log in to your DVR/NVR. Navigate to [System Info] > [Version] . | Error Message | Solution | | :---