Because JMicron has largely shifted focus to modern storage controllers, official support for older IEEE 1394 chips may not be available directly on the JMicron official download page . Instead, you should use the following sources:
To download and install the driver, you can use the built-in Windows legacy driver or download specific packages for older hardware. This controller manages FireWire ports, which are essential for transferring data from legacy equipment like DV cameras and external hard drives. Where to Download the Driver jmicron ohci compliant ieee 1394 host controller download