Use CH341A programmer software to Read and Backup your current (corrupted) BIOS first.
This guide outlines how to fix a corrupted BIOS on an using a BIOS binary ( .bin ) file, ranging from software recovery to manual hardware flashing. 1. Standard USB Recovery (No Hardware Required) hp pro 3500 series mt bios bin file fix
Visit HP Support and enter your serial number or select "HP Pro 3500 Microtower PC". Use CH341A programmer software to Read and Backup
HP Desktop PCs - BIOS Setup Utility information and menu options hp pro 3500 series mt bios bin file fix