We supply HP laptops to students at my university, and we were required to update the BIOS on every unit--students' laptops in for repairs or returned loaners--that came back to us. We used only the Windows BIOS update tools and not a single unit had any problems after upgade. Given a big company like HP, one would hope that something like that would work. Fortunate for myself and all the other student techs, it did.
I honestly have to say you had the bad luck or that the people that made the Windows BIOS update didn't know what they were doing. Personally, I would not have played with the BIOS first. I would have reformatted the system. If the problems continued, I would look at various other components, with the system board and BIOS being some of the last things I look at.
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