Here are few links that should help you with your next upgrade of the controller SANtricity OS:
Software upgrade instructions: https://docs.netapp.com/ess-11/topic/com.netapp.doc.ssm-sam-116/GUID-5A2C3761-E7E9-4700-A542-227C06B5DBA5.html
Software download page for SANtricity OS: https://mysupport.netapp.com/site/products/all/details/eseries-santricityos/downloads-tab
If you are planning to upgrade to a higher family release (ex: 11.60.x or 11.70.x), then it is recommended to verify your current environment and configuration (Host OS, HBA make/model, HBA Firmware/Driver) with our interoperability matrix. Link below:
Main Interoperability Page: https://mysupport.netapp.com/matrix/
On the main interoperability page, select advanced search then look for E-Series SAN Host. Add it to your search criteria, then select "Next >> Refine Search Criteria" to populate your environment details.