Solution : https://service.sap.com/sap/support/notes/603972 (SAP Service marketplace login required)
Key words : 
cd <tmp>  <sapcd>/<os>/sapcar -xvf <sapcd>/<os>/v8fp<nr>, <dbsw>/das/bin/db2admin stop  <dbsw> -->, <dbsw>/instance/db2iupdt db2<sid> iv, fixpak 9 fixpak 10 fixpak 11 fixpak 12 fixpak 13sap, <dbsw>/instance/dasupdt <user> 2, /opt/ibm/db2/v8, relevant ibm db2 fixpak, empty temporary <tmp> directory, install fixpak 9 full install, administration server user <user>
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