Reverse CRM EHP upgrade

Hi Experts,

I did EHP3 with NW740 upgrade for CRM 7.0 EHP2 with NW730 and got completed successfully in production system.

After upgrade due to some enhancement functionality the custom components in CRM_UI faced some major issues.

Posted message to sap and tried to rectify but before solution, our production downtime is closed and customer asked us to revert the upgrade.

I had restored the database backup taken during down time phase and now system is up and running with CRM 7.0 EHP2 with NW730.

Now the issue is customer wants to again to start upgrade with different SP level. in order to do that i need to reset upgrade completely.

I did not took backup of SUM directory during downtime phase start.

So how can i reset the upgrade manually ?, i believe the only step needs to be carried out is to clear all shadow tables from database and change few status tables.

Please help me in providing the manual steps with standard documentation.

Regards,

Giridharan