just tried to do this with win7 guest and yosemite with newest version of virtualbox (5.0.20). got a "not responding" during firmware update. lost ability to power on the psyclone evo. found the usb in hardware profile. somehow the product ID changed. tried to set the product ID and serial in virtualbox, however osx grabs it before virtualbox could so it stays greyed out no matter what. copied the vm to my fedora box host, set the product id , vendor id, serial and windows guest immediately recognized it and i was able to finish updating the firmware and it worked no problem. after this happened to me, i noticed a bunch of people said it happened to them. Maybe there should be some kind of warning in big caps.
