Using Android Debug Bridge (ADB) commands for debugging or unlocking the bootloader.
Uninstall the existing Samsung drivers via Control Panel, restart the PC, and install them again. Exynos 3830 Usb Driver
Fix: The driver is not running in Download Mode. Power off the phone completely. Hold the keys together while plugging the phone into the PC to properly trigger Samsung Download Mode. Using Android Debug Bridge (ADB) commands for debugging
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Safely move photos, videos, music, and documents between your phone and computer. restart the PC