All data will be erased by this method, take backup of all data like messages, Contacts, Notes etc on mobile memory and store them on computer hard drive.
How To Hard Reset MANTA MID1007 Via Key CombinationPower off MANTA MID1007.
Press and hold Volume Down + Power keys together.
When Android factory reset menu will appear release the keys.
With volume down Select Wipe data/factory reset option and press Volume Up button to confirm option.
Select Yes...... delete all user data and press Volume Up button to confirm.
Reboot mobile to complete the method.