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Before changing a device release, save the configurations you want to keep.
Select the device and open Properties from the topology toolbar.
Check the current OS version before choosing a different release.
Select a supported target version and read the release evidence shown below it.
Choose Preview to review the configuration changes before applying the upgrade.
Inspect the lines carried over unchanged and any lines that will be translated.
Review Dropped carefully because any listed configuration lines will be lost.
The preview itself does not change the running version.
Choose Upgrade to review the final confirmation and its reload warning.
Cancel if you are not ready to change the device.
When you are ready, confirm the upgrade to apply the reviewed change and reload.
Wait for the device to finish reloading before checking its console.
Run show version to verify the release that the device now reports.
Check the saved configuration to confirm that the settings you need remain present.
Reopen the lab and Properties to confirm that the selected release was kept.
This changes the simulated device release; it does not install a real firmware image.