How to Make Sure All Your Data Is Securely Removed when Selling Your Android !
No Root Device :
Step 1: Encrypt Data
- A lock screen password (can be enabled in Security settings)
- A charged battery
- The device must be plugged into a charger
Step 2:Factory Reset
With all of the data on your device using an encryption key, there is even less of a chance someone would be able to access it even after recovering it from its wiped state, so all that is left to do is to actually wipe all of your data.
To wipe your stock Android device, head to the “Backup & reset” section of your Settings app and tap the option to for “Factory Data Reset.”
The wiping process will take some time, but once it’s finished, your Android will reboot and you will see the same welcome screen you saw the first time you booted it up. All that is left to do is power it down and get it ready to be shipped off or sold.
Keep in mind the stock user wipe procedure will work for rooted devices as well, but if you’d rather use TWRP to perform the wipe, that will also work.
From there, tap Advanced Wipe and select Cache, Dalvik Cache, Data, and Internal Storage. If the person you are selling the Android to requested anew ROM to be flashed on the device prior to the sale, then you will also need to select System before you Slide to Wipe. Once the wipe completes and after you’ve flashed a new ROM, if necessary, power off your device and it will be ready to go.