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Setting the policy to Enabled means the value of the required_platform_version manifest key of the zero-delay, autolaunched kiosk app is used as the autoupdate target version prefix.
Setting the policy to Disabled or leaving it unset means the required_platform_version manifest key is ignored and autoupdate proceeds as normal.
Warning: Do not delegate control of the Google ChromeOS version to a kiosk app, because it might prevent the device from getting software updates and critical security fixes. Delegating control of the Google ChromeOS version might leave users at risk.