MSSQL 2012 How to update to SP3

i use MSSQL 2012 no service pack (sharepoint database) ,

 i have proprem error rbs 211 ,

so i want to update to sp3 ( Error when you run RBS Maintainer in SQL Server 2012 or SQL Server 2014   https://support.microsoft.com/en-us/kb/2979304)

can i update to 2012-->sp3  or update 2012-->sp1->sp2->sp3

best regards

chatchai-netd