If you are attempting to repair a device that is boot-looping or "brick" (non-functional), follow these general steps:
.rar (Part 1 of a multi-part archive). You will need all parts (Part 1, Part 2, etc.) in the same folder to extract the contents successfully. Download File s706C-7731-D2(168)-V1.0.part1.rar
Install the Spreadtrum USB Drivers on your PC so the computer can recognize the device in "Download Mode." Flash the Firmware: Open the SPD Upgrade Tool (also known as ResearchDownload). Load the .pac file extracted from your archive. Click the "Play" or "Start" button. If you are attempting to repair a device
Flashing firmware will erase all data on the device. Back up any important information if possible. Download File s706C-7731-D2(168)-V1.0.part1.rar
Ensure you have the complete set of .rar files for this version.