Solution : https://service.sap.com/sap/support/notes/1657890 (SAP Service marketplace login required)
Key words :
dbs/db4/dltoldpkg = noyou, downward-compatible kernel, sap management console, start procedure changed, instance profile parameter, call dltoldpkg automatically, startsap calls dltoldpkg, start profile entry, startsap option dltpckg, dltoldpkg call