Google added a new demotion protection feature to Android Oreo, and Google is now pressing handset makers to turn it on to prevent attackers from downgrading the phone to an unsafe system version.
It is understood that this protection is equivalent to the anti-theft device to add another side of the security network.After adding the downgrade protection, back to the older version of the operation will be banned, Google think this behavior is not safe, it is for the attacker Provide a loophole.In addition, downgrade protection can also prevent the phone is stolen Brush.
Although this feature is part of Android Oreo, not all Android devices running Oreo will support it.According to Google, the downgrade protection works in conjunction with the Project Treble upgrade mechanism, but the upgrade mechanism vendors do not seem to be cold, such as Nokia 8 and one plus 5 made it clear that does not support, because of concerns about equipment brick.
