When SMG boot up after the upgrade it stuck with the error:
error: file '/vmlinuz-3.10.0-1160.36.2.e17.x86_64' not found
error: you need to load the kernel first.
SMG 10.9
A common cause of this failure is an insufficient /boot partition size. If the partition is too small, the upgrade process may fail while updating the kernel and boot components.
Please refer to the following article for details: SMG upgrade fails due to insufficient / boot partition size
If the /boot partition is indeed too small, the recommended solution is to reinstall SMG so that the partitions are recreated with the correct sizing.
This is outlined in: "Kernel Panic - not syncing: VFS: Unable to mount root fs... " after upgrade of Messaging Gateway