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So a friend of mine is selling his phone and he wants to permanently delete the phone data so it can't be restored. He did format it but a factory reset will not solve it so what the best technic to delete the data permanently 

His phone is  oppo a1 k

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7 hours ago, dilpickle said:

As long as the phone is encrypted a factory reset is all you need.

But I heard that it can be restored after normal formatting 

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13 minutes ago, Mascarad ninja said:

But I heard that it can be restored after normal formatting 

No it can't. That's the whole purpose of encryption.

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1 hour ago, Mascarad ninja said:

And how to encrypt it 

Settings > Security > Encryption

 

Most phones from the last few years should already be encrypted.

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