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Here we choose any two of Android data recovery softwares to test how they scan deleted data from Samsung phone. See why factory reset won't delete everything on Andriod. There are many Android data recovery softwares in the market can easily scan all 'already deleted data' and the data from a 'Factory reset' phone. And you have no idea what he or she was going to do with the found data. It's very dangerous to get your privacy data exposed to someone who you are not familiar with. I found out occasionally that the data was still available by using certain data recovery software if you go with the default factory reset. However, there is a hidden bug laid on it if you didn't take it seriously.

The built-in factory reset is the most widely recommended and adopted data erasing method for most of Android users.

Why 'Simple Deletion' and 'Factory Reset' Won't Wipe Everything Part 1: Why 'Simple Deletion' and 'Factory Reset' Won't Wipe Everything Method 2: Completely Delete Photos from Any Android Phones & Tablet

For android download R-Wipe & Clean 20.0.2429