How to upgrade the Identity Centre from IDM 7.2 SP7 to SP8

Hi all,

I am currently working on SAP IDM 7.2 on NW 7.31.

The new task is to upgrade the SAP Identity center from version 7.20 SP7 to SP8 in sandbox system only.

The current version level which i found from Identity centre are

PRD -- Version 7.20.8  2014-02-28 720_REL

DEV -- Version 7.20.8  2014-02-28 720_REL

SBX -- Version 7.20.7  2013-06-06 720_REL

And when i login in to UI under  component information,  IDMFEDERATION component in Sandbox system is still running in 1000.7.2.7.0.20130108102054

Whereas same component patch level in Dev and Prod is 1000.7.2.8.0.20130508095747.

Other two below mentioned IDM components are already upgraded to sp8 in sandbox systems.

IDMIC                        ( 1000.7.21.8.3.20140206161124)

IDMPORTALCONT   ( 1000.7.21.8.0.20130516153851)

And all other UI components are running in SP7 only.

I couldn't find any doc which explains about the SP upgrade from 7 to 8

All I could find is the fresh installation of Identity center components.

Can any one please let em know how to proceed on this.

Thanks

Vimal