Upgrade Check list to SCCM 2012 R2

Below are the check lists to Upgrade SCCM 2012 Sp1 to SCCM 2012 R2

https://technet.microsoft.com/en-us/library/jj822981.aspx#BKMK_PlanningR2Upgrade

	System Center 2012 R2 Configuration Manager Upgrade Checklist
1	Ensure that your computing environment meets the supported configurations that are required for upgrading to System Center 2012 Configuration Manager SP1.
2	Ensure that your computing environment meets the supported configurations that are required for upgrading to System Center 2012 R2 Configuration Manager.
3	Review the site and hierarchy status and verify that there are no unresolved issues.
4	Install all applicable critical updates for operating systems on computers that host the site, the site database server, and remote site system roles.
5	Review requirements for any add-ins or extensions for Configuration Manager that you use.
6	Disable database replicas for management points at primary sites.
7	Reconfigure software update points that use NLBs.
8	Back up the site database at the central administration site and primary sites.
9	Disable all site maintenance tasks at each site for the duration of that site’s upgrade.
10	Run Setup Prerequisite Checker.
11	Download prerequisite files and redistributable files for System Center 2012 R2 Configuration Manager.
12	Prepare to upgrade secondary sites
13	Plan to manage server and client languages when you upgrade a site.
14	Plan for prerequisites for new site system roles, and ensure site system servers still meet prerequisite for installed site system roles
15	Review the list of considerations for site upgrades. https://technet.microsoft.com/en-us/library/jj822981.aspx#BKMK_UpgradeR2Considerations
16	Test the database upgrade process on a copy of the most recent site database backup.
17	Restart the site server and each computer that hosts a site system role to ensure that there are no pending actions from a recent installation of updates or from prerequisites.
18	Install System Center 2012 R2 Configuration Manager.
19	Upgrade stand-alone Configuration Manager consoles.
20	Reconfigure database replicas for management points at primary sites.
21	Reconfigure any database maintenance tasks you disabled prior to the upgrade.
22	Upgrade clients.