Sony vaio factory setting

Hello, I have a problem with my sony vaio
PCG-71312M. I try to put it in factory setting with pressing alt +F10 or F9 and its not working. Can you please help me ?

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Registration date
Monday February 1, 2010
Last seen
November 22, 2018
Thank you

The procedure is to Start your Sony laptop, and hold on pressing Alt + F10, if it doesn't work,

This CCM article will guide you:
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