These are instructions on how to manually install spreadtrum usb driver on windows computer (including Windows XP, Vista, Windows 7, Windows 8, 8.1 and Windows 10).
Now, the device manager will install the Spreadtrum driver on your computer (may take 1-2 minutes only).
Above you can see the spreadtrum driver is installed and listed in the device manager.
[*] Spreadtrum USB Driver is made to work on spreadtrum chipsets (spd) only. You need to install the Spreadtrum Driver to flash stock firmware using SPD Flash Tool.
[*] Driver is not digitally signed error: If you got this error then you need to fix the driver signature enforcement manually, for that see this tutorial.
[*] Spreadtrum Drivers are tested working with WriteIMEI Tool to Flash IMEI on spreadtrum devices.
[*] Credits: Spreadtrum driver is provided and distributed by Spreadtrum Inc Officially. So, full credit goes to them for the driver.