Process to Uninstall :-
Updates can only be uninstalled one at a time, in the reverse order of installation.
How to Uninstall in Windows –
START – Control Panel – Programs – look for program which needs to be uninstalled – right click and uninstall/ change
* if the installed program cannot be changed, It will not show change option. It will only give option to uninstall.
Uninstalling program will not revert CMS from 4.1 to 4.0. To get get 4.0 deployment , we must restore CMS database from backup after the uninstallation has completed.
After uninstalling the update, the previous version can redeployed using wdeploy which can be found at <INSTALLDIR>\SAP BusinessObjects Enterprise XI 4.0\wdeploy to your web application server. All components in your deployment must be at the same version level.
At one step, you SAP screen will show “WaitforCMSForTheFirstTime” for quite long time and SAP keeps thinking what to do next. 😕
I had the same situation and to proceed further, I started SIA (Server Intelligence Agent) and it worked.