Updating the BIOS on such boards is than with major brands because support pages are often defunct, and incorrect files can brick the board.
This is a niche request, as is not a mainstream motherboard brand (unlike ASUS, Gigabyte, MSI). Esonic typically produces low-cost, legacy motherboards (often for older Intel/AMD chipsets like LGA775, AM2/AM3) or industrial boards. esonic bios update
Do you have the specific Esonic model number on hand? I can attempt a targeted search for its BIOS file. Updating the BIOS on such boards is than