Hi,
Thumbs up to Jackie007's advice.
This is the best way to complete the upgrade process.
Only one more thing I would like to add i.e upgrade path for you.
It's from SEP 11 RU4 --> SEP 12.1 RU1 --> SEP 12.1 RU1 MP1
You can not directly jump to the latest version i.e SEP 12.1 RU1 MP1