Need To Sell Some Phones - How Do I Make Sure Data Is Unrecoverable?

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30 Aug 2014
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Got a Note 3 and a couple S7 Edges to sell. Hypothetically speaking, let us say they were loaded with pics of my hairy naked body.

What's the best way to prevent these pics from surfacing?

Also user name/passwords, private keys, account info etc...

I have already flashed stock ROMS on the phones.

Was thinking of finding a random vid, like a Teletubbies episode, then load up the phones with duplicates of it to overwrite any sensitive data.

Also how do people recover sensitive data on phones? Sometimes it's best to put yourself in the position of one of these guys to check if you can recover stuff from your own wiped phone. What software do they use? I have forensic software to recover deleted files from HDDs and SSDs... have used on MicroSDs as well but never on an actual phone's flash memory.

Thanks.
 
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