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Introduction The HP ProBook 640 G4 is a reliable business laptop, but like any computer, it can suffer from BIOS corruption—resulting in a black screen, continuous beeping, or failure to boot. In such cases, a BIOS bin file (binary dump) is the key to recovery. This article explains what the file is, where to find a clean dump, how to flash it, and essential precautions. What Is a BIOS Bin File? A BIOS bin file is an exact, byte-for-byte copy of the SPI flash memory chip that stores the UEFI firmware. For the ProBook 640 G4, this chip is typically a Winbond 25Q64 (8 MB) or 25Q128 (16 MB) depending on the configuration (main BIOS + EC firmware sometimes combined).
