1. Install driver.
2.Open Flash Tool
3. Open Download Agent and select MTK_AllinOne_DA
4. Open scatter_loading and select scatter file
SW---> WBW6803WA_0410_T8142→ MT6577_Android_scatter_emmc
5. Click Firmware->Upgrade and connect USB cable with mobile without battery
6. Insert Battery then start downloading..
7. When it shows Firmware Upgrade , then installation is completed.
After Firmware Upgrade give Reset to Factory Setting
here you go, you are now on Jelly Bean!!!
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