SQL Server R2 also has backup database errors

Error message Description

The database is backed up on a server that is running version 10.50.1600. This version is incompatible with this server (running version 10.00.1600). Restore the data on the server that supported the share,
Or use a backup that is compatible with this server (Microsoftsqlserver.smo)

Cause of error
One of the two databases on this computer is the SQL Server version, and the other is the SQL Server R2 version.
The data backup file should be attached on the SQL Server R2 version, and the instance where my SQL Server R2 version is logged in is a SQL Server version, so the data restore incompatibility error is raised.

Workaround

Change the instance used by SQL Server R2 login, using the default instance of SQL Server R2.