Solution : https://service.sap.com/sap/support/notes/490247 (SAP Service marketplace login required)
Key words : 
cd <sapmnt>/<sapsid>   mv exe exe_32   mkdir exe   mv profile profile_32   mkdir profile   cp profile_32/ profile 5, cd <sapmnt>/<sapsid>/exe  /<cd-mount>/unix/aix_64/sapcar -xvf  <cd-mount>/unix/aix_64/sapexe, cd <sapmnt>/<sapsid>/exe  /<cd-mount>/unix/aix5_64/sapcar -xvf   <cd-mount>/unix/aix5_64/sapexe, <cd-mount-point>/unix/aix5_64/fixpak/sapcar -xvf <cd-mount-point>/unix/aix5_64/fixpak/db2fp, <cd-mount-point>/unix/aix/sapcar -xvf <cd-mount-point>/unix/aix/db2aix, sar  /<cd-mount>/unix/aix_64/sapcar -xvf <cd-mount>/unix/aix_64/sapexedb, sar  /<cd-mount>/unix/aix5_64/sapcar -xvf   <cd-mount>/unix/aix5_64/sapexedb, /usr/lpp/db2_07_01/instance/db2iupdt db2<dbname>, mountpoint = <cd-mount>, unix/aix5_64 directory
Related Notes : 
       
| 595304 | DB6: Availability of the 32bit kernel for Release 6.20 | 
| 546900 | DB6: Restoring a 32-bit backup to a 64-bit instance | 
| 544274 | FAQs: DB2/UDB 64-bit support | 
| 500990 | DB6: SQL1707N during migration to 64-bit | 
| 356828 | DB6: Migrating to 64-bit for AIX, Linux x86_64, and Solaris | 
| 101809 | DB6: Supported Fix Packs IBM DB2 for Linux,UNIX and Windows |