On universal hardware products, new software activations automatically detect the uboot image, check if it is valid, and then compare the version of the uboot image with the version currently on the system. If the system started with the default uboot image, indicated by Boot Version Used in the show sys-info uboot command output, and the uboot image in the activated software release is newer, image synchronization performs a default uboot upgrade. After the default uboot upgrade is complete, the show sys-info uboot command output displays the uboot version from the system boot time, so it still shows the previous version, but it also indicates that the default uboot was upgraded and that a system reboot is required.
After you reboot the system for a default uboot upgrade, if a temporary default uboot upgrade file is present on the system, if the system started with the default uboot image, and if the default and alternate uboot versions are not the same, the alternate uboot is upgraded. You must restart the system for the alternate uboot upgrade to take effect.