To fix a corrupted HP Pro 3500 Series MT, you will need the following tools:

Before resorting to an external programmer, verify if your system shows these specific signs:

: Tools like AsProgrammer or NeoProgrammer are recommended for better chip detection. Step-by-Step Programming Guide

: The fans spin and LEDs light up, but the monitor remains blank.

Follow these steps to flash the "fixed" BIOS file to your system: How to reset bios on hp pro 3500? - Facebook

: A clip allows you to read/write the chip without desoldering it from the motherboard.