Downgrading

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upgraded mac os x mountain lion. not start, stays @ loading screen apple logo. can use recovery mode, , there option reinstalling, unable that. there way can downgrade lion recovery mode?

edit: not have backup. yes, idiot not backing up, don't have external hd so.

 

according mountain lion board, ml apparently puts new firmware on hdd, , makes pretty hard downgrade. that's quick read through of ml board though.

short of pulling drive, reinstalling on new one, , migrating data over, can't think of way fix that.

 

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