Factory reset Android

[pychzloya]

My wife want to sell his old Galaxy S5. Is a factory reset secure enough to delete all data on the phone?

[WestCoasterBC · Accepted solution]

@pychzloya Data encryption is enabled by default if your device is running marshmallow. A factory reset is then sufficient as your data will not be readable after the reset.

If you're running lower then marshmallow navigate to: Settings>Security and select Encrypt Phone. Then factory reset the device.

Don't forget to remove your SIM/MicroSD card.

[ElvinSloth]

How to factory reset a Galaxy S5 using hardware keys

If you find that the touchscreen is unresponsive, there’s a problem accessing the menu, or you forgot your pattern lock, then you can still factory reset your S5 using the hardware keys.

Step 1: Turn your Galaxy S5 off.

Step 2: Simultaneously press and hold the Volume up button, the Home button, and the Power button until the Android icon appears on your display.

Step 3: Use Volume down to highlight the wipe data/factory reset option, and press the Power button to select it.

Step 4: Use Volume down again to highlight Yes — delete all user data, and press Power to select it.

Step 5: Wait until you see the reboot system now option and use the Power button to select it.

Step 6: When your S5 restarts, it should be wiped and ready to set up again.

NOTE: If you’re wiping your S5 to sell it on or give it away, then we recommend removing accounts before you factory reset.

You can do this by going to Settings > Accounts, tapping on each account and then tapping More at the top right and Remove account.

[MiriamCarpenter]

Don't try to sell your old phone, even you delete all data with hard reset still your data deleted can recover the buyer if they want to recover it. Just what I observed.