Unable to apply SP2 CU2 or SP1 CU9 patch to SQL 2014 RTM Enterprise Edition

Hi all,

I am trying to apply patch upgrade to SQL 2014 Enterprise edition(12.0.2000.8). But check boxes are disabled where we select SQL Instance to upgrade. Error states:

When tried to apply SQL 2014 SP1 CU9 patch, Error is-
The version of SQL Server instance MSSQLSERVER does not match the version expected by the SQL Server update.
The installed SQL Server product version is 12.0.2000.8, and the expected SQL Server version is 12.1.4100.1.

When tried to apply SQL 2014 SP2 CU2 patch, Error is-
The version of SQL Server instance MSSQLSERVER does not match the version expected by the SQL Server update.
The installed SQL Server product version is 12.0.2000.8, and the expected SQL Server version is 12.2.5000.0.

Please help. Thank you.