You need to upgrade the SEPM to 12.1 RU2 first than you can go to 12.1 RU2 MP1
This KBA explains it
Upgrading or migrating to Symantec Endpoint Protection 12.1.2100 (RU2 MP1)
Article:TECH204449 |
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Created: 2013-03-28 |
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Updated: 2013-04-04 |
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Article URL http://www.symantec.com/docs/TECH204449 |
Migration paths
Symantec Endpoint Protection 12.1.2100.2093 (RU2 MP1) can migrate seamlessly over the following:
Symantec Endpoint Protection 12.1.2015.2015 (RU2)