Solution : https://service.sap.com/sap/support/notes/673723 (SAP Service marketplace login required)
Key words : 
sdbuninst -package jdbc -package_dir /sapdb/programs, valid release format reason, linux>= sap db version 7, jdbc                /sapdb/programs, valid release formatwrn, starting preparing phase, prerequisites operating system, software installation/upgrade, invalid version id, package jdbc
Related Notes : 
       
| 669711 | Additional information about MaxDB upgrade to 7.5.00 |