You have probably read about how Avast recovered images of semi naked women and obscene selfies from a couple of old cell phones they bought online.
The reality dawned on folks that hard resetting your smartphone doesn’t make your embarrassing drunk photos vanish away.
Fortunately, there is the Avast! Anti-Theft App Avast, a free Android App that will guide you through permanently Deleting and overwriting data next time you wish to sell off your smartphone.
Install the Avast! Anti-Theft App from the Play Store
Follow the prompts and complete the setup.
Link your device to your Avast account, if you lack one, you can create one for free.
Step # 4
With that done, log in to your My Avast Account > My Device > Choose Device > Choose Command > Wipe
The command is automatically sent to your Smartphone, and all the Data will be permanently deleted and Junk Data rewritten to prevent recovery.