Do you know the soldered to the board (e.g., Celeron J1900)? What is the capacity of your BIOS chip (e.g., 25Q64)?
If the motherboard cannot POST, software utilities like Rufus or FreeDOS are useless. You must use a hardware programmer to force-feed the binary image directly to the EEPROM chip. Required Hardware Inventory cm-494v-0 bios bin