If you absolutely need updated microcode or a specific fix, consider replacing the motherboard with a used ASUS/MSI H61 board (often $20–$30) rather than gambling on an obscure BIOS file.
Most Esonic H61 boards (especially VG4 and H2-MV revisions) feature an "EZ Flash" or "M-Flash" style utility.
Because the official Esonic website often lacks direct download links for legacy boards, users typically rely on community repositories and specialized archives:
There are two primary ways to update an Esonic H61 motherboard.
There are two primary ways to flash an BIOS on an Esonic H61.
