Firmware Download Link-
Primo E5 Firmware
1. Install driver.
2. Open Flash Tool
3. Open scatter_loading and select scatter file
(Primo E5 Firmware Ã softwareÃ MT6572_Android_scatter)
4. Click Firmware Upgrade
5. Now select Download and then connect USB cable with mobile (mobile must be off)
6. If you see below image, it means that mobile is detected through Usb cable
7. When it shows Download Ok, it means the installation/flashing firmware is completed.