Endpoint Protection

Kindly provide SEP 11.x to SEP 12.1 Upgrade process.

you can check this artical,

https://www-secure.symantec.com/connect/articles/sep-11x-sep-121-upgrade-process-graphical-overview

few more links

System Requirements for Symantec Endpoint Protection and Network Access Control 12.1 Release Update 1 (RU1)

http://www.symantec.com/docs/TECH174720

Upgrading or migrating to Symantec Endpoint Protection 12.1.1000 (RU1)

http://www.symantec.com/business/support/index?page=content&id=TECH174545

Additional articles:

http://www.symantec.com/docs/TECH163707
http://www.symantec.com/docs/TECH163602
http://www.symantec.com/docs/TECH162623
https://www-secure.symantec.com/connect/articles/how-upgrade-your-sep11-license-sep12-online

Go through this URL and you will find everything:

How to upgrade the Symantec Endpoint Protection Manager (SEPM) to Version 12.1 RU1

http://www.symantec.com/business/support/index?page=content&id=TECH176260&actp=search&viewlocale=en_US&searchid=1333291073099

Thanks AR for sharing this URL.