SPD refers to Spreadtrum Communications, a Chinese semiconductor company now part of Unisoc. They produce low-cost to mid-range SoCs (System on Chips) used in hundreds of Android devices from brands like Samsung (some A-series), BLU, Tecno, Itel, Infinix, Doogee, Ulefone, and many others.
This often indicates that the driver is unsigned. You must disable Driver Signature Verification in your Windows Startup Settings before installing. spd sciandroidusbdriverjungov4 link
In the world of mobile repair, there is a legendary "phantom bridge" known as the Jungo Driver SPD refers to Spreadtrum Communications
Improves the communication protocol between the PC and the Android device, reducing connection errors. reducing connection errors.