The bios update is buggy, you can't roll back due to a ''feature'' added with it which doesn't let you roll back bios AT ALL
Call HP Support, tell them about the update causing problems. They can't roll it back, even if you send the laptop in for repairs. Insist that the BIOS update is the problem and has to be investigated by development team.
NOTHING THEY ADVISE YOU WILL FIX THE ISSUE. THE UPDATE IS FAULTY.
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