Install ROM: - Unpack FlashTools, and Click on Flash_tool.exe - Select a the MT6752_Android_scatter.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. - Click "Download" button (For example: Kitkat --> Kitkat) OR If upgrade ROM Click "Firmware -> Upgrade" (For example Kitkat --> Lollipop = Upgrade) - Connect your phone into the computer via USB data cable. - The process will start and a red progress bar will appear - When finished, green checkmark will appear - You can now safely disconnect your phone and turn it on.