Users believe that once a factory reset is performed, their data is completely removed from the device and is no longer accessible. Rather, it is possible to recover data after a factory reset and may be useful if you accidentally reset and want to restore your data since by default it is not Encrypt Android devices, which means that even after performing a factory reset, some data is still available on the device's internal storage.
There are tools available such as Fonedog that can connect to a device that has already been reset and extract deleted files, which may include here personal data such as contacts, texts or images, and thus to protect your data you need to encrypt your device before factory reset but since the release of Android 6 "marshmallow" automatic encryption is in the form of hypothetical.
If you want to make sure that your data is not accessible after a factory reset, there are tools available that can overwrite data on your device using garbage, this ensures that your personal files are completely inaccessible, and to do that, you can use an app like Shreddit and it will The application erases data from both internal and external storage on your device
Start by making sure your device is encrypted and then download and run the Shreddit app and then erase the important files with it and not in the normal way and then make a factory setting and this will erase all data from your device completely so this method is the best way if you plan to sell your device
Download Fonedog
Download Shreddit
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