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Root Problem with flashing x10mini

frnzzz hlp me out in this whn im about to flash my x10mini using flash tool im gettng error lik tis...
ERROR - ERR_SEVERITY="MAJOR";ERR_CLASS="SECURITY_CLASS";ERR_DYNAMIC="SIN header verification failed"�

wht dos it mean,and wht shld b done for this,,,thnks in advance......
 

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