Software Download Link- Primo F6 firmware
1. Install drivers
2. Open Flash Tool
3. Open scatter_loading and select scatter file
(Primo F6 Firmware>Walton_Primo_F6_S006_02072015àMT6580_Android_scatter)
4. Click FirmwareUpgrade then select Download and then connect USB cable with mobile (mobile must be off)
5. Now start downloading/flashing firmware
6.When it shows Download Ok, it means the installation/flashing firmware is completed.