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What is the recommended method to downgrade the version of Fireware OS without losing device configuration settings?

  1. Restore a saved backup image

  2. Use the Upgrade OS feature in Fireware Web UI

  3. Change the OS compatibility setting in Policy Manager

  4. Use the downgrade feature on Policy Manager

The correct answer is: Restore a saved backup image

The recommended method to downgrade the version of Fireware OS without losing device configuration settings is to restore a saved backup image. This approach ensures that the device settings, which include configurations, policies, and any specific adjustments made on the device, are preserved and restored alongside the older firmware version. When restoring a backup image, the process typically involves using a configuration file that represents the device's state at the time the backup was created. This means that once the older version of the OS is loaded onto the device, all previously saved configurations are reapplied seamlessly. This method also minimizes potential issues that could arise during a downgrade, such as inconsistencies or loss of configuration that might occur with other methods. In contrast, the other methods listed may not guarantee the retention of configuration settings. For example, using the Upgrade OS feature generally focuses on upgrading rather than downgrading and may not handle the unique requirements of reverting to an older version. Changing the OS compatibility setting in Policy Manager is more about ensuring compatibility and may not facilitate an actual downgrade. Finally, while using the downgrade feature on Policy Manager sounds appropriate, it might not effectively preserve all device settings in the same way a backup restoration would. Overall, restoring a saved backup image is the most reliable way to ensure