6.11 upgrade to 7.01 failed

Hi everybody,

Cell Manager : Windows 2008 R2 with DP 7.01

Install Server : Red Hat Linux 5.4 32 bits

Clients : Debian 5 32 bits and Debian 6 64 bits

I tried to update from CM with Install Server Red Hat and i have this message :

[Normal]  Starting installation session on mardi 2 décembre 2014, 14:53:43...

[Normal]  Getting list of clients for installation...

[Normal]  Connecting to client server.debian...

[Normal] <server.debian>  Checking for response from system svm00504.gfiouest.private.

[Normal]  Client server.debian (Linux 2.6.32-5-amd64) OK.

[Normal] <server.debian>  Starting installation/update for client system server.debian at mardi 2 décembre 2014, 14:53:58.

[Normal] <server.debian>  Updating Core Component

[Critical] <server.debian>  Update of Core Component failed!
A different version of the Data Protector Cell Manager is installed on the system.
Remote upgrade of the Cell Manager to a newer version is not supported. To add components
to the Cell Manager system, ensure that an Installation Server of the same version is used.



[Critical] <server.debian>  Update of client system server.debian failed!

[Normal]  Installation session finished on mardi 2 décembre 2014, 14:54:10.


============================================================================
                      Session completed with errors!
============================================================================

Donot Iupdate aclient in v6.11fromCM in 7.01 ?

Thanks.

Stéphane