How to clear the Iphone memory before selling without the possibility of recovery?

Question

iPhone

Greetings! Let's start with the fact that I'm paranoid, sealed the camera on the computer and retired from all social networks. networks. Now I have to cope with a new obstacle and not stick together flippers from fear and constant paranoid thoughts. The question is this, I need to sell an iPhone, I am aware of a complete reset of the gadget to factory settings. But there is a feeling that even after this procedure, the data is quite possible to recover, and I even suspect that with tools that are in the public domain. Is there some kind of program that will thoroughly erase all the information and prevent an attacker from gaining access to my personal information? Thank you in advance!

Answer 1

If paranoia still does not let go - do not sell your old devices, give them to children to be torn apart, after that you will not be able to restore anything from them.

Answer 2

With such paranoia - just replace the memory chip, and break the old one

Answer 3

Erase through dfu
You are unnecessary to anyone and no one will bother with restoring your information