Dahua Technology DH-IPC-HDEW Series Quick Start Manual page 24

3.2 Installation Method
3.3 (Optional) Installing SD Card
SD card slot is available on select models.
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Disconnect the power before installing or removing the SD card.
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Do not open the cover for more than 30 min to avoid spray in cameras.
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Press and hold the reset button for 10 seconds to default the device.
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Figure 3-3 Installation method
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Quick Start Guide