-Firstly format microSD card. Most phones have an option somewhere in the settings. Go to Settings > SD card and phone storage. First, tap on “Unmount SD card’. Then tap on “Format SD card” to wipe out data from external SD card.
-Factory data reset, also known as a factory wipe or hard reset. Removes any personal data and apps and returns the phone to the default state. Menu > Settings > Privacy > Factory data reset.
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