Solution : https://service.sap.com/sap/support/notes/99434 (SAP Service marketplace login required)
Key words : 
cd /general/r3server/patches/rel40b/os400/v4r1m0              namefmt 1              lcd /tmp              bin, cd '/usr/sap/put'              car '-xvf /tmp/ua40b, licence program 5769ss1 'os/400 - qshell       interpreter', license program 5769ss1 'os/400 - qshell interpreter', '/usr/sap/put/bin/r3up, directory           /usr/sap/put/ua, '/usr/sap/put/ua/ua, upgrade assistanti/    important general remarksthe, /    important general remarksii/   actions, upgrade assistant------------------------< c5018355  17/nov/99 >---------------------symptom
Related Notes : 
       
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| 134058 | Additional Info: IS-Oil Installation 4.0B | 
| 121928 | IS-Oil Upgrade to 4.0B with CA-JVA 4.1B | 
| 108377 | Additional Info: Upgrading to 4.5A DB2/400 | 
| 99379 | Additional Info: Upgrading to 4.0B DB2/400 |