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Determining which service release you have installed in CCSv3.3 is a bit tricky.
The recommended way to do it is to go to menu in CCS and select Help -> About.
Note the CCS version #.
Then compare this with the version # listed on the service release download page:
https://www-a.ti.com/downloads/sds_support/CCSv3.3ServiceReleases.htm
For example SR12.1 is 3.3.82.13.
Some older Chip support packages messed up the CCS version # displayed in the about dialog. If this is the case for you the chances are that you have a pretty old service release and should consider installing a newer one (which will also fix the version #).
Regards,
John