Because modern Windows environments strictly enforce driver signatures, installing older Jungo-based drivers requires specific initialization steps.
The system automatically switches between ADB, Fastboot, and Diag modes depending on the device status.
If the phone is not detected, try connecting it without the battery (if removable) or while holding the Volume Down/Up button to trigger the "Spreadtrum COM Port" mode.
If the device still isn't recognized, follow this manual procedure: Open on your Windows PC. spd sciandroidusbdriverjungov4 link
The Jungo driver framework was popular around 2012–2017 for debugging ARM-based embedded devices. Modern SPD chips (SC7731, SC9832, SC9863, Tiger T series, etc.) use standard USB classes for download mode. The SCI interface today often relies on Microsoft’s USB serial drivers or a lean, signed driver from Unisoc.
⚠️ The packages from 2013-2016 are old and unsigned. As a result, Windows 7, 8, 8.1, 10, and 11 will block their installation by default due to mandatory driver signature enforcement.
Upon reboot, press or F7 to select Disable driver signature enforcement . Step 2: Run the Executable Installer Extract your downloaded .zip file using a tool like 7-Zip. If the device still isn't recognized, follow this
If you've installed the driver but the Android Debug Bridge (ADB) tool cannot see your device in the command line, the problem is often with your ADB configuration.
If your goal is to connect an Spreadtrum/Unisoc Android device to Windows for flashing or debugging, you need one of the following official or community-vetted drivers:
If you plan to use , you must inform the ADB server about Spreadtrum's USB Vendor ID. Otherwise, you will type adb devices and see nothing listed. The SCI interface today often relies on Microsoft’s
This achievement marked the beginning of a new era in smartphone technology. SciAndroid’s SPD, powered by the Jungo V4 driver, quickly gained attention from tech enthusiasts and industries worldwide. It wasn’t long before their innovation found its way into various sectors, from healthcare and education to environmental science and entertainment.
This is a generic category of drivers that enable Android Debug Bridge (ADB), fastboot, and MTP on Windows. However, is separate—it handles “preloader” or “download” mode, which most generic Android USB drivers do not cover.
Click on any item in the list, go to the menu, and select Add legacy hardware .