How to check if someone has already unlocked the bootloader?

[lenovomen]

Hi,

On a new phone, how can I check if someone has unlocked the bootloader before me? Is this possible? Or will I not see this? For example: what if it contains malware and has been locked back up with it? When dealing with a guarantee, how can you tell if someone has already unblocked it?

 

[Poney70]

Hello,

You normally can't have a working device if you relock the bootloader with a modified/tampered system partition but, if you are scared about that, you can always flash a fastboot ROM via MiFlash.

 

[lenovomen]

Hello,

You normally can't have a working device if you relock the bootloader with a modified/tampered system partition but, if you are scared about that, you can always flash a fastboot ROM via MiFlash.

Is there no way to trick it? So, when the Mi flash tool locking the ROM will check it if someone modified this? And if it contain malware or other wrong code will not close?

 

[Poney70]

Is there no way to trick it? So, when the Mi flash tool locking the ROM will check it if someone modified this? And if it contain malware or other wrong code will not close?

You can always lock the bootloader, no checks are done.

Checks are done after that: If the system partition is modified/tampered, you will only see a red triangle with "The system has been destroyed" message when the device is booting.

 

[lenovomen]

You can always lock the bootloader, no checks are done.

The issue comes after that: If the system partition is modified/tampered, you will only see a red triangle with "System has been destroyed" message when the device is booting.

Do the bootloader check the small changes? For example DNS redirection? Can you say that a factory system is impossible to manipulate? So even a used appliance is safe?

 

[Poney70]

Do the bootloader check the small changes? For example DNS redirection? Can you say that a factory system is impossible to manipulate? So even a used appliance is safe?

It's something beyond my knowledge.

That's why you can always flash an Official "fastboot" ROM to be certain to use a "clean" device.

 

[lenovomen]

It's something beyond my knowledge.

That's why you can always flash an Official "fastboot" ROM to be certain to use a "clean" device.

Okay, thank you for the advices.