SPD Driver

If your phone is not detected by Research Download Tool or Upgrade download tool or other box/dongle that support SPD cpu download and install this.

SPD Driver 

You can either install  this 4 versions;

1. SPD_Driver_R4.20.0201
2. SPRD_NPI_USB_Driver_v1.4
3. Spreadtrum_Jungo_USB2Serial
4. Spreadtrum_SCI_USB2Serial

or this single signed SPD driver installer

1. Signed_spd_driver_auto_Installer