You typically only need to flash or update the HKM0126 firmware if you encounter specific issues:
The "hkm0126" isn't a widely known consumer product, but in the world of niche electronics and industrial hardware, it typically refers to a specific type of HDMI KVM (Keyboard, Video, Mouse) Extender Matrix Switch hkm0126 firmware
Connect your device to a reliable power source. A power loss during an update will ruin the machine. You typically only need to flash or update