If You have operating System User try
http://help.sap.com/hana/sap_hana_administration_guide_en.pdf
3.1.1.3 Reset the SYSTEM User's Password
Page 412
If You have operating System User try
http://help.sap.com/hana/sap_hana_administration_guide_en.pdf
3.1.1.3 Reset the SYSTEM User's Password
Page 412