A: Yes, using the same DOS flash method with an older ROM file. Some OEMs lock downgrades; if so, force flash using AFUDOS /GAN (advanced switch).
Get the latest BIOS package from the official ECS Support Site . Ecs H61h2-mv Bios Update
Why this matters
If you have an OEM system, do use ECS’s generic website; go to the OEM's support page (Acer, Gateway, etc.) instead. Comprehensive Guide to Updating the BIOS on the