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Understand warning about operating system safety

When you turn on an Android device, the operating system gets checked to make sure that it's safe to use. This means that the code running on your device comes from a trusted source and hasn't been changed or corrupted.

If there could be a problem with your operating system, you might get one of these warning messages to let you know:

"Your device has loaded a different operating system." (Yellow)

What this warning means

This message lets you know that your device has a different operating system than the one that originally came on your device.

What you can do

The steps you should take depend on whether you changed the operating system on purpose. If you aren't sure, you probably didn't change it yourself.

I didn't change the operating system myself

You can continue using your device with the current operating system, but you may have a better experience with the original operating system.

You can contact your device manufacturer's support center for help restoring the original operating system. Before you restore the operating system, make sure that any data you have on the device is backed up. Learn how to back up a Pixel phone or back up a Nexus device.

If you have a Pixel phone or Nexus device, learn how to get help.

I changed the operating system on purpose

You can choose to continue to use your device with the operating system you installed.

If you have a Pixel phone or Nexus device and want to restore your operating system, you can flash your device with the latest factory image. Learn how to flash your device.

Dismiss the warning

The warning message should go away on its own after about 10 seconds. Your device will continue starting up.

If you still see the warning message, you can continue starting up your device by pressing the Power button once.

If you're not comfortable continuing to use the device, you can turn it off by pressing and holding the Power button until your device turns off. You can contact the device's manufacturer for help restoring the original operating system.

"Your device software can't be checked for corruption. Please lock the bootloader." (Orange)

What this warning means

Your device is in an "unlocked" state. This means that your operating system can't be checked to make sure that it's safe to use.

What you can do

The steps you should take depend on whether you changed the operating system on purpose. If you aren't sure, you probably didn't change it yourself.

I didn't change the operating system myself

If you use your device with an "unlocked" operating system, your device may be exposed to security risks. We recommend that you restore your device to the original operating system.

You can contact your device manufacturer's support center for help restoring the original operating system. You can say that you see the error: "Your device software can't be checked for corruption. Please lock the bootloader." Before you restore the operating system, make sure that any data you have on the device is backed up. Learn how to back up a Pixel phone or back up a Nexus device.

If you have a Pixel phone or Nexus device, learn how to get help.

I changed the operating system on purpose

If you unlocked your device on purpose, you can continue to use your device. However, you acknowledge that your device may be exposed to security risks.

If you aren't making changes to the operating system regularly, we recommend that you lock the device by running fastboot lock to improve security.

Dismiss the warning

The warning message should go away on its own after about 10 seconds. Your device will continue starting up.

If you still see the warning message, you can choose to continue starting up your device by pressing the Power button once.

If you're not comfortable continuing to use the device, you can turn it off by pressing and holding the Power button until your device turns off. You can contact the device's manufacturer for help restoring the original operating system.

"Your device is corrupt. It can't be trusted and may not work properly." (Red)

What this warning means

The operating system on your device has been changed or corrupted and is not safe to use. The device may not work properly and could expose your data to corruption and security risks.

What you can do

The steps you should take depend on whether you changed the operating system on purpose. If you aren't sure, you probably didn't change it yourself.

I didn't change the operating system myself

You should not use the device in its current state. We recommend that you restore your device to the original operating system.

You can contact your device manufacturer's support center for help restoring the operating system to the one that came on the device. Before you restore the operating system, make sure that any data you have on the device is backed up. Learn how to back up a Pixel phone or back up a Nexus device.

If you have a Pixel phone or Nexus device, learn how to get help.

I changed the operating system on purpose

If you modified the operating system on purpose, you can continue to use your device. However, you acknowledge that your device may not work properly and your data could be exposed to corruption and security risks.

If you have a Pixel phone or Nexus device and want to restore your operating system, you can flash your device with the latest factory image. Learn how to flash your device.

Dismiss the warning

The warning message should go away on its own after about 10 seconds. Your device will continue starting up.

If you still see the warning message, you can choose to continue starting up your device by pressing the Power button once.

If you're not comfortable continuing to use the device, you can turn it off by pressing and holding the Power button until your device turns off. You can contact the device's manufacturer for help restoring the original operating system.

Amy

Amy is an Android expert and author of this help page. Leave her feedback below about the page.

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