Hello Abdul
I see that you have already completed the downtime phase.
The SUM tool should unlock the system after the downtime phase which is at the end of the "Execution" phase.
Were there any errors which you bypassed before you reached this phase ?
What happens when you select "Continue" and move further ?
Login to the system with DDIC user and check the patch level of all the components.
If you are unable to continue further with the upgrade tool then unlock the system using the TP command from the OS level and then try.
If the upgrade is not done well and if there is an inconsistency the prepare for a restore of the system and revert back to the old kernel and start the upgrade from scratch.
Regards
RB