Fixing a corrupted BIOS on an (Microtower) typically involves either a "soft" reset, a USB-based recovery, or—in extreme cases—using a hardware programmer to flash a .bin file directly to the chip. Method 1: The "Soft" CMOS Reset
Insert this drive into the affected HP Pro 3500 and use the key combination mentioned above to force a flash from the USB. : hp pro 3500 series mt bios bin file fixed
HP Pro 3500 MT supports (blind flash):
After flashing the fixed bin:
(optional but recommended).