This read-write boolean, when set to true, swaps the device's primary and secondary application images; the object automatically reverts to false once the swap operation completes. An admin sets it to true to switch which of the two stored application images (primary or backup) is active, then confirms completion by watching this value return to false. For example, an admin who just installed a new firmware image as the backup would set this object to true to activate it as the running image, then verify the switch settles back to false once the swap finishes.