Some people asked on the forum previously (here and here). No one reported any success.

thanks bvideo

Although an adapter might be able to deliver basically the same data stream over USB, it is pretty doubtful that the driver for your audio interface would be able to handle that data coming in on a different port and protocol.

A more promising avenue might be to find a firewire card that would attach to a standard interface like PCMCIA or Expresscard. That would include the translation you would need so that the firewire data is arriving and recognized as a firewire port. It would still not guarantee success. There have been persistent reports of firewire cards using other than Texas Instuments chips working with Sonar.
  
http://www.amazon.com/s/?ie=UTF8&keywords=laptop+firewire+card&tag=googhydr-20&index=aps&hvadid=20402348069&ref=pd_sl_8drgrehi0i_b

JUST USE THE USB PORT! Firewire is just about dead anyway. 

I am hoping Presonus will come out with a new version of thier 16.04 mixer board that has USB instead of Firewire.  I would have a use for that.

Yes I have a PCMCIA  port on a PC that I've used  for several years on stage (with Sonar) and it 100% worked at all times, I loved it. But with The newer PC there is no PCMCIA port....
I have a Steinberg MR816x that is super steady so I'd love to keep this running. But I do believe that Firewire's days are numbered.
The real solution would be a hub like device that is smart enough to deal with both protocols and trasfer data between the protocols in real time. 

The real solution would be a hub like device that is smart enough to deal with both protocols and trasfer data between the protocols in real time. 

That is not the problem. The problem is having software installed on your computer that will make the incoming data appear to be coming from a virtual firewire port, so that applications designed for firewire input will see it as firewire input. The lack of such an invisible intermediary driver seems to be what makes the firewire-USB adapters unusable in most cases.