"We have successfully tested that after unloading AppleFWOHCI.kext the current tools won't work anymore."

If that's true then an option for those who need to use FW/TB devices is to remove the drivers from the system folder to prevent loading at startup and kextload/kextunload on demand.

The following named drivers are present in "/System/Library/Extensions/" :

IOFireWireAVC.kext IOFireWireFamily.kext //(The AppleFWOHCI.kext mentioned above is included here) IOFireWireIP.kext IOFireWireSBP2.kext IOFireWireSerialBusProtocolTransport.kext

IOThunderboltFamily.kext AppleThunderboltDPAdapters.kext AppleThunderboltEDMService.kext AppleThunderboltNHI.kext AppleThunderboltPCIAdapters.kext AppleThunderboltUTDM.kext