Upgrade from build 9121 to 9200

Upgrade from build 9121 to 9200

Hi everybody,
I have a problem when I want to migrate the build 9121 to the build 9200.
I get an error: 
  1. Unable to start the DB. Possibly server is running if so Please shutdown the server 

                         (or) 

    Previous upgrade is failed and the message for the same will be displayed in the Command Prompt.


Many thanks for your help.
Regards,
Mateusz

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