Exynos Usb Device4000 Hot Jun 2026
In this state, the phone exposes itself to a PC as SEC, SYSTEM LSI Exynos USB Device 4.0.0.0 . Because this low-level mode lacks sophisticated thermal management software, the Exynos SoC (System on Chip) or its integrated modem can pull unrestricted current via the USB cable. This results in a localized thermal runaway event at the USB port or the motherboard itself, often throwing "USB device overcurrent status detected" errors on the host PC. SEC, SYSTEM LSI Exynos USB Device 4.0.0.0 - DriverMax
Exynos SoCs support USB On‑The‑Go (OTG), which allows the phone to act as a USB host and power external devices such as USB flash drives, keyboards, or even small fans. When you connect an OTG accessory, the phone must supply 5 V power to the accessory through its own battery. That draws significant current from the battery’s power management circuit, and the phone’s USB controller must also handle all the data traffic.
Exynos SoCs have supported USB 3.0 since the Exynos 5 series, offering theoretical speeds of 5 Gbps. On devices like the ODROID‑XU4, real‑world throughput can reach around 150 MB/s, comparable to desktop PCs. However, the internal bus architecture of the Exynos 5422 can become a bottleneck, limiting performance despite the USB 3.0 interface.
"USB Device4000" (often displayed as Exynos USB Device (4.0.0.0) in Windows Device Manager) is a driver label that appears when a USB device—most often a Samsung flash drive, a smartphone in a special mode, or a bricked device—is connected to a PC. The name suggests a low‑level communication port rather than a standard mass‑storage device. exynos usb device4000 hot
The error represents a critical nexus point between hardware distress and low-level firmware failure on Samsung Galaxy devices. When a Windows PC identifies a connected device under this specific COM/Serial driver name while the smartphone simultaneously generates extreme heat, the device is stuck in an unbootable state.
Whether you recently experienced any or dropped the phone.
Moisture or debris in the USB-C port can bridge pins, causing the computer to misidentify the device and triggering a "hot" electrical resistance. In this state, the phone exposes itself to
A complete halt to fast charging, with system warnings advising you to unplug the cable.
To eliminate software loops, you need to clear the cache of the system application responsible for the port. Open > Apps . Tap the filter/sort icon and toggle on Show system apps . Search for USBSettings and tap it. Go to Storage and select Clear Data and Clear Cache . Restart your phone. Isolate the Charging Hardware
The lthor and thor tools have known bugs. Compile the latest version from source: SEC, SYSTEM LSI Exynos USB Device 4
The Exynos USB Device 4000 is poised to transform various industries and applications, including:
Let the phone sit for 10 to 15 minutes until it cools completely down to room temperature. Step 2: Attempt a Hard Power-Cycle
: Under the "Ports (COM & LPT)" or "Universal Serial Bus devices" section of the Windows Device Manager, a connected device is registered exactly as SEC, SYSTEM LSI Exynos USB Device 4.0.0.0 .
A damaged USB cable, a loose connection, or an incompatible USB port can disrupt proper device enumeration. Windows may then fall back to a generic driver, leading to the error. Overheating can also be caused by excessive power draw from a faulty cable or port.