DPM 2012 R2 unable to connect to Database after failed Update Rollup 4 Installation

We have a DPM 2012 R2 Server with SQL Server 2012 installed locally.
We tried to install Rollup 4 for DPM 2012 R2 (KB3009516) using Windows Update
and it failed with error code 0x80070643. Now when we open the DPM Console
it is totally empty (no Protection Groups, Servers, Disks, just like a fresh install).
In the eventlog we get a lot of Errors and warnings:
Event 941 (MSDPM)
Unable to connect to the DPM database.  Make sure that SQL Server is running and that it is configured correctly.
Cannot open database "DPMDB" requested by the login. The login failed.
Event 4209 (MSDPM)
The description for Event ID 4209 from source MSDPM cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.
If the event originated on another computer, the display information had to be saved with the event.
The following information was included with the event:
DPM Writer encountered an internal error.  Please restart the DPM Writer service, and then try the backup operation again. For additional troubleshooting information, review the application event log and the DPM Troubleshooting Guide.
Event 107 (Report Server Windows Service (MSSQLSERVER)
Report Server Windows Service (MSSQLSERVER) cannot connect to the report server database.
Event 274 (SQLISService110)
Microsoft SSIS Service:
Registry setting specifying configuration file does not exist.
Attempting to load default config file.
Then there are some Errors/warnings from SQLSERVERAGENT about failed scheduled Jobs.
I think the failed Installation changed some database Settings, so that now the DPM Console
cant access the database anymore.
I would be happy if someone can help me getting this Server working again!

Our biggest problem is, that the DPM is not working any more. So there is no chance to backup the SQL Server via DPM.
I think the main problem is that DPM have no access to the database. Every time I start the DPM Application, I get an error "verify that the DPM service is running on this computer". In the eventlog are many errors that the msdpm service was unable
to connect to DPM Database. Another "information" is that the user 'nt authority\system' failed to open the database of dpm.
We've tried to reinstall the DPM but its still the same problem. I suppose that is a corrupt database.
Tomorrow I try to restore the database and hope it will be the solution of our problem.

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