Hello,
In way to perform a support packages update using the SUM tool in our SAP JAVA system we need to update first the SAP Kernel of this system (from 721 EXT patch 100 to 500/510).
I followed the SAP note 1713986 - Installation of kernel 721 (EXT).
I performed the update of igs helper (change the igs directory) and the Kernel files but unfortunately when I start the SAP system the jstart.exe doens´t start 
I ran the following command (sapcontrol):
sapcontrol -nr 21 -function GetVersionInfo
25.05.2015 19:09:13
GetVersionInfo
OK
Filename, VersionInfo, Time
D:\usr\sap\DBJ\J21\exe\sapstartsrv.exe, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:48:20
D:\usr\sap\DBJ\J21\exe\disp+work.exe, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:48:14
D:\usr\sap\DBJ\J21\exe\gwrd.exe, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:48:16
D:\usr\sap\DBJ\J21\exe\msg_server.exe, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:48:19
D:\usr\sap\DBJ\J21\exe\dboraslib.dll, 721, patch 500, changelist 1576121, optU (EXT), NTAMD64, 2015 04 29 18:07:24
D:\usr\sap\DBJ\J21\exe\dbmssslib.dll, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:12:29
D:\usr\sap\DBJ\J21\exe\dbdb2slib.dll, 721, patch 500, changelist 1576121, optU (EXT), NTAMD64, 2015 04 29 18:07:21
D:\usr\sap\DBJ\J21\exe\dbdb4slib.dll, 721, patch 500, changelist 1576121, optU (EXT), NTAMD64, 2015 04 29 18:07:22
D:\usr\sap\DBJ\J21\exe\dbdb6slib.dll, 721, patch 500, changelist 1576121, optU (EXT), NTAMD64, 2015 04 29 18:07:23
D:\usr\sap\DBJ\J21\exe\dbsybslib.dll, 721, patch 500, changelist 1576121, optU (EXT), NTAMD64, 2015 04 29 18:07:25
D:\usr\sap\DBJ\J21\exe\enserver.exe, 721, patch 510, changelist 1577701, optU (EXT), NTAMD64, 2015 05 07 02:59:23
D:\usr\sap\DBJ\J21\exe\icman.exe, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:48:16
D:\usr\sap\DBJ\J21\exe\sapwebdisp.exe, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:48:20
D:\usr\sap\DBJ\J21\exe\jcontrol.exe, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:48:17
D:\usr\sap\DBJ\J21\exe\jlaunch.exe, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:48:18
D:\usr\sap\DBJ\J21\exe\jstart.exe, 721, patch 510, changelist 1577275, optU (EXT), NTAMD64, 2015 05 05 06:48:19
As you can see above the patch level is 510, the latest kernel files that I patched, so... I don´t know why the SAP system doesn´t start.
Can you help me please? How can I correct this issue?
Kind regards,
JD