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For Volantis+ devices, we will give users the ability to enable OEM unlock through Developer Settings. To do so, we must write the value to the last byte of a special partition that does not get erased even after factory reset. This feature will only be available on devices with the persistent data partition, thus the checkbox is only visible for devices that meet this requirement. This depends on https://googleplex-android-review.git.corp.google.com/#/c/495350/ DD: go/factory-reset Bug: 14288780 Change-Id: I8f80b950bc101a1067912faf221391bf0dd826b7