Hi,
For any support upgrade the below prerequisites need to check.
1) Take full backup before you upgrade,
2) Check the latest SPAM level and SAP BASIS component are met as per requirement.
3) Suspend the background job using (BTCTRNS1) and lock the user during upgrade.
4) Also check the space in directory "/usr/sap/SID".
3) Release open transport request confirmation.Don't not keep any modifiable/open request in the system.
Thanks & Regards,
Brindavan