Now download the Microsoft Firewire 1394 OHCI Legacy Driver Installer and remember where you downloaded the file to. Then once you have downloaded the installer, follow the instructions below. Microsoft Firewire 1394 OHCI Legacy Driver. Find where you downloaded the file to. It will have the filename 1394OHCILegacyDriver.msi as shown above. (1) Download (How to install Legacy IEEE 1394 Firewire driver in Windows 8 x86 MOTU) repair utility. (2) How to install Legacy IEEE 1394 Firewire driver in Windows 8 x86 MOTU (3) PCI FireWire IEEE 1394 3+1 Port Card install? (4) T61p - IEEE 1394 (Firewire) port does not show up in device manager in Windows 7 x64 (5) Firewire (IEEE 1394).