Download the SP Flash Tool from here.
Unzip the archive where you want the program to be saved.
Before launching the program download the specific firmware file for your tablet from here.
In the SP Flash Tool folder launch the flash_tool executable.
The program will look like this:
Flash tool main window.
Click on Scatter-loading button in order to load the firmware file.
Browse to the location of the firmware file and search for the scatter file.
From the drop-down menu of the Flash Tool program choose Firmware Upgrade
Press the Download button.
With the device powered down connect it to the computer
The progress bar in the bottom of the Flash Tool program will now cycle through the following stages.
When the yellow bar has reached 100% a Download OK pop up will appear and the process is complete.