How can I erase my phone completely and securely before selling it for someone else? I have read that secure deletion procedures used on regular hard disks are ineffective on flash drives connected through USB, due to inability to tell the embedded controller to effectively erase all of the data, or something like that.
Not sure about internal storage though (both phone storage and internal SD card), however both of this and the SD card should be erased securely, so that I can be absolutely sure that none of my private data will be available to the next user.
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