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Flash Type SPD7731
Flash With Flash Tool And Any Flash Box
***** How To Flash Solution *****
Install the drivers.
Open Flash Tool
Open the Flash Tool. Enter folder named "ResearchDownload_R3.15.4901". Then enter file named "Bin". There you will see an icon named "ResearchDownload.exe"
You will see this window
Click "Load Packet". New window will appear.
Enter "Primo EF4+ Firmware" folder and select "Primo_EF4+_S008_05092016.pac" file
Firmware Upgrade Click "Start"
After clicking the "Start", press the volume down key of your handset, and connect it to your computer with USB cable. Remember: Before connecting the handset with your computer, you must turn it off. Also notice that the battery has to be kept inserted.Flash operation will begin, you will see this window
There will appear "Passed". This means it is successful.