Never update during a storm. If possible, connect your PC to an Uninterruptible Power Supply (UPS).
Otherwise, . The H61 chipset is old, and a failed flash means buying a CH341A programmer or a new board. Ecs H61h2-mv Bios Update
ECS typically provides two ways to update this motherboard: using a Windows-based utility (eBLU/Cap_To_Rom) or a traditional DOS/EFI flash. The is highly recommended as Windows utilities are prone to crashing on older platforms. Phase 1: The "Cap to Rom" Transition (If Applicable) Never update during a storm