CRM 2011 Rollup 8

Hello Experts,

I try to install the RollUp 8 for Microsoft dynamic CRM 2011, the RollUp installed successfully but the version of the CRM doesn't change, the Deployment version is still 5.0.9690.1992, but it must be 5.0.9690.2243.

I try to import an organization from CRM Server with RollUp 8 to the another CRM server with RollUp 6,

the Import operation failed because of incompatible versions of the CRM.

any Help please ??

thank you.