You will need two steps:
1.
Please go to the Back and Restore tab.
The choose SystemV46 partition in the restore to inbuilt defaults section and click on the Restore Inbuilt defaults when it becomes active (BLUE). You will be offered the option to merge or replace the files, choose replace.
This should reset your SystemV46 to the version it shipped with, depending on the age of your image this may not enough to boot from, so got to step before attempting to boot...
2.
Now go to the advanced updates section and update just system.lhaps. This will apply the latest updates.
Hope this helps, let me know of any problems.
