Isnt it downloadable from hp's site if you perform a dump from a dv6820 then it will contain the serialnumber and so from the other laptop. isnt it a function for emergency restore of bios on these machines i think so some keys you press while you boot and you have the .rom file on a usb flashdrive good luck! shame is that i had a dv6820 that i sold like a month ago so i can not help you with that.
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