Never turn off the PC during the flash process, as this will result in a bricked motherboard.
Please enter BIOS setup menu by “DEL” key while start up system or follow manual instruction to get into the setup menu. ECS ELITEGROUP H61H2-MV｜Motherboard｜Products ｜ECS ELITEGROUP ecs h61h2mv bios update portable
ECS motherboards often support a feature called "Q-Flash" or "M-Flash," which allows you to update the BIOS directly from the motherboard's built-in firmware. This method doesn't require a USB drive or any software. Never turn off the PC during the flash
Once the flash process is successful and the PC restarts, you need to restore your system settings. Turn off the PC completely and unplug it from the wall. This method doesn't require a USB drive or any software
Restart the PC and tap or Del to enter the boot menu or BIOS. Boot from your USB drive into the DOS command prompt.
Some ECS boards require the BIOS file to be named exactly H61H2MV.ROM (all caps). Check the readme.