Nieche A619
Install ROM :
Unpack FlashTools, and Click on Flash_tool.exe
Select a the MT6572_Android_scatter_emmc.txt in ROM
Wait file to be added into Flash Tool
choose Option->USB Model,click USB Model
–> Choose Option->DA DownLoad All->Speed->High Speed, click High Speed
Turn off your phone, remove the battery.
"Press F9 (hit Download button)" OR " if upgrade ROM Firmware->Upgrade "
and connect your phone into the computer via USB data cable.
The process will start and a red progress bar will appear after color purple, yellow.
And green circles display
Finish !