Which phone is this for?
#secure erasing android phone.
ornate lodge
finite galleon
I think if you just factory reset it, that will erase everything
analog elk
What device is it?
ornate lodge
Unlocking the bootloader will erase everything
A factory reset wipes user data. The core of the system doesn't contain anything important of yours anyway
finite galleon
Im pretty sure the point of factory resetting a phone is brining it back to the point it was at from the factory — without any of the user data.
queen pond
Well a hard factory reset will help you.
Usually soft reset is available in phone settings.
Hard reset should be available in firmware options. Visit official site for hard reset or contact customer care or youtube