All you need to do is :
- Stop SAP
- Download the kernel archives (SAPEXE and SAPEXEDB)
- Extract them
- Backup the old kernel at DIR_CT_RUN (/sapmnt/SID/exe)
- Delete the old kernel at DIR_CT_RUN
- Put the new kernel at DIR_CT_RUN
- Replicate them to the DIR_EXECUTABLE (/usr/sap/SID/DVEBMGS00/exe)
- If you have additional application servers then replicate them to (/usr/sap/SID/D01/exe)
- Run saproot.sh SID
- Start SAP
Make sure there shouldn't be any kernel files present from the old release present at DIR_CT_RUN and DIR_EXECUTABLE locations.
Regards
RB