Hi, can I go back from software version OS X 10.8.1 (12B19) to my old software?

Hi, can I go back from software version OS X 10.8.1 (12B19) to my old software?

Which version old software?
Which exact model computer?
Did you make a complete clone backup of your old system before upgrading and are you prepared to have things revert to that?
Usually downgrading operating system requires a complete erase of the computer.  You then clone a previous backup, or completely re-install the operating system and all software plus data files you put somewhere for safekeeping while doing all the other things.  Also some of your data files may have been irrevocably updated to newer versions that will not open on the old system.  Basically, downgrading is not simple unless you prepared for the eventuality in advance.

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