Solution : https://service.sap.com/sap/support/notes/832561 (SAP Service marketplace login required)
Key words : 
sql_execute user-type=dba call drop_schemas  err  -24988, report  /sapapo/om_lc_upgrade_50  switch livecache state back, offline  sap livecache instance update exited abnormally, scm extract/load upgrade strategy [page 6], <indep_data_path>/wrk/sapdbupdate_install-<date>-<time>, tablename  = '__$__lcflag'  err  -24988, livecache dvd program sdbupd, relevant operating system directory, /    important general informationii/   errors, livecache transaction data  stored
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