Updating the BIOS on such boards is than with major brands because support pages are often defunct, and incorrect files can brick the board.
Do you have the specific Esonic model number on hand? I can attempt a targeted search for its BIOS file. esonic bios update
Triple-check the exact model number and PCB revision. If uncertain, attach a clear photo of the motherboard to a tech forum (like Badcaps.net or Vogons) for positive identification before flashing. Updating the BIOS on such boards is than