DeviceRollbackAllowedMilestones

Specifies the minimum number of Google ChromeOS milestones rollback should be allowed starting from the stable version at any time. Default is 0 for consumer, 4 (approx. half a year) for enterprise enrolled devices. Setting this policy prevents rollback protection to apply for at least this number of milestones. Setting this policy to a lower value has a permanent effect: the device MAY not be able to roll back to earlier versions even after the policy is reset to a larger value. Actual rollback possibilities may also depend on the board and critical vulnerability patches.