This is the stock firmware for S9920 MTK6577 Smart Phone.
Download link:s9920 firmware.
Flash tool:Download flash tool
2.A new windows will be on you pc screen as below. click the”scatter loading ”
Choose the files:”MT6577_Android_scatter_emmc.txt”in the package.
Step 3: Click the “Download ”and turn off your Smartphone .Then connect your phone with your PC through the USB cable .