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On Linux (Ubuntu, Debian, Arch), the kernel’s power management feature “autosuspend” can put idle USB ports to sleep. When a flashing tool like lthor sends data after a brief pause, the kernel wakes the port, but the Exynos device may have already timed out. The resulting error is logged as “hot” removal/insertion.
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The "Exynos USB Device4000 Hot" message typically indicates that your Samsung device has detected excessive heat or a hardware conflict specifically within the or charging circuit . This can occur due to faulty cables, moisture in the port, or system-level bugs in the Exynos chipset's power management. Immediate Fixes On Linux (Ubuntu, Debian, Arch), the kernel’s power
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Modern Exynos devices utilize advanced Power Delivery (USB-PD) and Samsung Programmable Power Supply (PPS) standards. If you use a low-quality, non-compliant third-party cable or charging brick, the handshake between the charger and the Exynos USB controller can fail. The charger may push maximum voltage continuously, overwhelming the phone's internal voltage regulators. 3. Corrupted USB Stack Firmware
If you have disassembled the device, from the logic board.