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If none of these work, your laptop’s BIOS chip may need a full reprogramming using a CH341A programmer (a topic for another guide).
Turn on the laptop. When prompted for the BIOS password, press Enter or type any password incorrectly 3 times.
On another device, search for “HP BIOS unlock code generator” (use a trusted source—many free online tools exist). Popular options: bios-pw.org or a Python script called “hp_password_tool”.
