Hi Phaneendra,
After checking different log (mainly usecase,dev_jstart, dev_flighrec) it seems like this upgrade process got failed/aborted many time since beginning and you fixed those and continued the same. So one main issue found was with "com/sap/engine/offline/OfflineToolStart" and with missing files/directories with shadow instance in SUM directory.
I will suggest if possible to reset your upgrade and start fresh again OR you can refer few of the SAP Notes (This is my opinion, maybe other experts can provide you other solution)
2164743 - Missing JAR file prevents the system's startup
1903663 - Java class is not found: com.sap.engine.offline.OfflineToolStart.
Thanks,
MPS