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I own a Huawei P9 EVA-AL00 (bought in China) on Android 7 with no root. Last time I reset my device, some photos were still left.

So, what is the best way to reset an Android device?

I'm not worried about security, privacy and encryption, but I do want all junk files, photos etc. to be removed from the device.

I know the 2 methods to reset - through recovery and settings, but is there a better way? For example, can you reset through Android Debug Bridge?

Thanks,

George

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    Safe way is to encrypt your phone and factory reset to ensure that files on your device are not accessible to any one
    – beeshyams
    Commented Mar 30, 2017 at 5:40

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Reset to default
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While both methods (factory-reset through settings and through recovery) should have the very same effect, both also usually leave the SD cards (internal and external) alone. So if you really want to clear all things up, you should "wipe" those as well. Some devices/ROMs offer to include the cards in factory reset, with others you'll have to do that manually – either by deleting all files, or by going to Settings › Storage and chosing to format them.

If you were "worried about security, privacy and encryption", I'd instead recommend you a tool to "securely wipe" all partitions, i.e. overwrite everything with garbage.

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