Solution : https://service.sap.com/sap/support/notes/1297742 (SAP Service marketplace login required)
Key words : 
---------------------< i024101 aug/29/05 >-----------------------------phase detect_start_release_components failsthe phase detect_start_release_components fails, guides --------------------< i036200 jan/26/10 >-----------------------------downloading support package stacksadditions, prepare phases ----------------------< i035760 feb/25/08 >----------------------------source rel, start_j2ee_ep phasethe bootstrap process fails, --------------------------< d031901 nov/02/05 >-----------------------free space requirements, ----------------------------------------------------------------------- ii/ important general information --------------------< d050980, downloading support package stacksaug/07/09, upgrade phases ----------------------< i024101 oct/21/08 >---------------------------error, 6000 mb -------------------------<d039661 oct/12/05>--------------------------apply note 873624, support package files included
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