refers to a specific legacy Windows driver version developed by SEC (Samsung Electronics Co.) System LSI. This driver is primarily used to facilitate a low-level serial communication link between a PC and Samsung devices powered by Exynos chipsets. Understanding Exynos Usb Device-4.0.0.0

These are . Odin works only with the Exynos interface. The Qualcomm mode requires QFIL or QPST tools. Mixing them can permanently damage the bootloader.

To understand the driver, you must understand the boot process. When an Exynos-powered Samsung device is connected to a PC in normal operation, it enumerates as a composite device (MTP, ADB, RNDIS). However, when the device is powered off and then connected while holding specific button combinations (typically on older devices, or Volume Down + Volume Up + USB Connect on newer models without a Home button), the boot ROM loads a minimal, low-level USB stack.

The driver is digitally signed by and is compatible with a wide range of Windows versions: Driver for SEC, SYSTEM LSI Exynos USB Device 4.0.0.0

The version number—4.0.0.0—is the telltale signature of Samsung’s official USB driver package, typically released alongside the Samsung Mobile USB Driver for Windows (versions circa 2016-2020).