The journey led Alex to a somewhat obscure but incredibly useful database that cataloged USB devices by their VIDs and PIDs. After entering the VID 1f3a and PID efe8 into the database, Alex discovered that the device was a specialized USB-to-serial converter, designed for industrial applications. However, the entry also noted that the device required a specific driver to function correctly on most operating systems.
Used by developers on Linux/Windows for low-level access. ⚠️ Important Context
: FEL mode is very sensitive to power fluctuations; use a high-quality USB cable. usb vid 1f3a&pid efe8&rev 02 3 driver
Save the rule as /etc/udev/rules.d/50-sunxi-fel.rules and reload udev:
If your device remains constantly trapped on this ID and won't boot into its normal operating system, its internal flash memory (eMMC) may be corrupted or entirely blank. A complete re-flash via PhoenixSuit is required to restore default operation. The journey led Alex to a somewhat obscure
Every USB device carries a unique identifier known as the (VID) and Product ID (PID). When you see vid_1f3a&pid_efe8 , you’re looking at two hexadecimal values: vid_1f3a identifies the manufacturer, and pid_efe8 identifies the specific product or operating mode.
Click on to bypass automatic web scans.
Represents the sunxi SoC OTG connector in FEL/flashing mode.
: For Windows users whose goal is to flash official firmware onto a specific Allwinner device (like a tablet or TV box) using the manufacturer's tool, this is the go-to solution. PhoenixSuit is a Windows application designed for this purpose, and its installation can automatically install the necessary drivers. If this doesn't happen, the AW_Driver folder found in its installation directory (or as a standalone package) is the driver to install manually. This is a specialized driver designed to make your PC recognize the 1f3a:efe8 device. Used by developers on Linux/Windows for low-level access
Flashing configurations require precise power lines. Avoid magnetic cords, extra-long extensions, or charging-only cables. Use a high-quality, short USB OTG cable attached directly to your computer's motherboard ports.
Under normal circumstances, Windows comes with a large database of built-in drivers for common USB device classes (mass storage, HID, audio, etc.). However, Allwinner’s FEL mode is a standard USB device class — it is a vendor‑specific, low‑level debugging and flashing interface. Without a proper driver, Windows cannot communicate with the device or assign it to a functional driver, resulting in the notorious yellow exclamation mark in Device Manager and the error “This device cannot start.”