Failure during upgrade SQL2008R2 to SP1 (Errorcode 0x84B20001)

TITLE: SQL Server Setup failure.
SQL Server Setup has encountered the following error:

A failure was detected for a previous installation,
patch, or repair for instance ‘instance name‘ during configuration
for features [SQL_Replication_Core_Inst,SQL_Engine_Core_Inst,
MPT_AGENT_CORE_CNI,SQL_FullText_Adv,]. In order to apply this
patch package (KB2528583), you must resolve any issues with the
previous operation that failed. View the summary.txt log to
determine why the previous operation failed.

Solution: Start – Run – regedit (Registry Editor) – Program Files – Microsoft SQL Server – MSSQL_10_50.instance name – ConfigurationState  on the right side change the values from 3 to 1 for SQL_Engine_Core_Inst, SQL_FullText_Adv, SQL_Replication_Core_Inst.

Please try again upgrading.

Error code 0x84B20001

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