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Data management
Formatting a microSD card
Formatting a microSD card erases all of the data currently
stored on it.
In the home screen → "Settings" → "Storage"
"Unmount SD card" → "OK"
The "Erase SD card" option becomes enabled.
"Erase SD card" → "Erase SD card"
Enter the security code to unlock your phone
→ "Continue"
Tap "Erase everything"