I like to roll back to my old OS mountain lion system from This latest Mavericks

I have purchase a MACBOOK PRO in 2012 for my music station at home to use PROTOOLS 10.0.
It was working fine until I inadvertantly updated to the latest OS of OS X Maverikcs
Now I am in troulble using my PROTOOLS 10.0, I guess PROTOOLS not ready for this new OS X.
How can I roll back to my old OS Mountain lion system?

Restore from the backup you made before upgrading to Mavericks.
If you didn't make a backup there's no way to just "roll back" - you'll need to reinstall Mountain Lion.

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