Oppo A31 (CPH 2015) Formatting user data successfully remove by Hydra Tool
1. Run MTK Tool and choose "Sosc"
2. Choose Brand and Module.
3. Go to "Service"--> "Tool"
4. Choose "Ultra Power Option"
5. Choose "Format / Erase" from drop down menu
6. Click on "Execute"
7. Connect device to computer using USB Data Cable.
8. Wait until the operation is completed.
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