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‎01-02-2020 03:38 AM

HP Recommended
Product: HP 840 G2
Operating System: Microsoft Windows 10 (64-bit)

I have hp elite book 840 g2 5th generation core I7 touch screen  now its running windows 10 pro due to some issue I would like to downgrade win 8 or win 7  but i,m not sure with this laptop which preinstall windows came, as this laptop i brought used one from someone he left and i even don't have any windows keys please help me out is there way to find out which version was  pre windows or else if i can downgrade it

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