1)Switch off the Samsung Galaxy J7.
2)Now press and hold together volume up + Home + Power button simultaneously.
3) After the display Samsung logo release the power button then if Android recovery is display release the all button
4)Then press Volume button recovery mode menu wipe data/factory reset is appear and click power button to confirm. 5)Select Yes-delete all user data then choose reboot system now.
6)Samsung Galaxy J7 Hard Reset is done.