Selling your phone or tablet? Here’s how to wipe your Android ph

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Selling your phone or tablet? Here’s how to wipe your Android ph

Selling your phone or tablet? Here’s how to wipe your Android ph


By Simon Hill

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How to wipe your Android phone
Simon Hill / Digital Trends

Our smartphones are privy to some of our most important secrets. Sensitive business emails, financial details, contact information, and perhaps even arisqu photo are not things you want falling into the wrong hands.Performing a factory reset is always a good idea, but it might not always be enough. Whenthe security firm Avast bought 20 Android smartphonesfrom eBay, for example, it was able to recover photos, Google searches, emails, text messages, and contact details.We’re going to show you how to wipe your Android phone properly, to make sure that can’t happen to you.

Factory Reset Protection

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You’ll want to start by removing Factory Reset Protection (FRP). Google introduced FRPin Android 5.0 Lollipop as an extra layer of security. It’s designed to prevent thieves from being able to steal your phone, wipe it, and then use it or sell it.

When you factory reset a phone with FRP enabled and try to set it up as a new device, you’ll be prompted to enter the user name and password for the last Google account that was registered on the device. If you don’t have those details, then the phone will remainlocked and you can’t gain access. Obviously, this is no good if you’re trying to sell it or give it away.

Here’s how to disable it:

  1. This step will differslightlydepending on yourphone. On a Samsung Galaxy, go to Settings > Lock screen and security > Screen lock type and choose None. On an LG G6, go to Settings > Display> Lock screen > Select screen lock and choose None. On a Google Pixel, go to Settings > Personal > Security > Screen lock and choose None.
  2. The next thing you must do is remove your Google account. On a Samsung Galaxy, go to Settings > Cloud & accounts > Accounts and tap on Google, then tap the three vertical dots in the upper right orMore > Remove account. On an LG G6 or a Google Pixel, go to Settings > Accounts & sync > Google and tap the three vertical dots in the upperright, then tap Remove account. If you have more than one Google account registered with your phone, then make sure you remove all of them.
  3. If you have a Samsung Galaxy, then you should remove your Samsung account, too. To do this, go to Settings > Lock screen and security > Find My Mobile. Then, enteryour password, tap on your account at the top, andselectMore > Remove account.

Once your Google and Samsung accounts have beenremoved, you can proceedwith the factory reset.

How does a factory reset work?

When you do a factory reset on your Android smartphone, it’s supposed to wipe it clean, but it doesn’t. It deletes the addresses of all of your data, so it no longer knows where it’s stored, but it doesn’t actually overwrite the data. That being the case, it’s possible for someone to employ off-the-shelf recovery software and get some of that data back. Let’s look at how to wipe your Android smartphone properly.

Encrypt your data

The first step is to encrypt your data. This option is built into Android, and requires you to entera PIN or password every time you turn yourphone on. It means that anyone attempting to recover data from your phone after you will need a special key to decrypt it, and they won’t have the key.

  1. Fully charge your phone or keep it plugged in to the charger while this process is running, because it can take several hours depending on how much data you have.
  2. The exact method for navigating this next step will differ slightly from phone to phone. It will generally be Settings > Security > Encrypt phone. But on a Samsung Galaxy, for example, you want to go to Settings > Lock screen & security > Protect encrypted data.You have the option to encrypt the SD card as well, but if you’re passing the phone on, we would recommend removing it instead.

If your phone came with Android 6.0 Marshmallow or above, it shouldbe encrypted by default, and you can skip to the next section. If you’re unsure about which version ofAndroid your phone is running, then take a look in Settings > About device/phone > Software info.Keep in mindthat it will only be encrypted by default ifAndroid 6.0 Marshmallow was installed out of the box.

Factory reset the phone

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Make sure that you have anything you want to keep backed up before you do this because it will wipe everything. The steps are generally the same for most Android devices, but some manufacturers like to be different.

  • On most Android phones, go to Settings > Backup & reset > Factory data reset and then tap Reset phone or Reset device. On a Samsung Galaxy go to Settings > General Management > Reset > Factory data reset and then tap Reset device. We also have a separate guide on how to factory reset a Galaxy S8.

When the process is done, your phone will be wiped and any data that could be recovered will be encrypted and should be impossible to decrypt. It’s now safe to sell your Android smartphone, or pass it along to someone else.

Overwriting with junk data

If you want to be absolutely certain, you can overwrite the encrypted data with junk data and then perform another factory reset then it would be genuinely impossible to recover any of your old data. This is probably overkill. If you want to do it, however, then simply load a bunch of dummy data onto yourphone until the storage is full a few large videos should do the trick and then perform another factory reset.

You can also get an app to do it for you. There are a few options in the Play Store, such asSecure Erase with iShredder 6.

There you have it. That’s how you completely wipe your Android phone. Let us know if you have a better technique.

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