at the moment this is a mac only piece of software, but hopefully soon we (RaYmAn, myself and a few others) will have a linux/windows version.
usage is simple, "tar xvf sbkdetect.tar; ./sbkDetect" while your device is attached in APX mode. it should take a few seconds to run, paste the result back in this thread along with the first few digits of your serial number (eg: B5OKAS...)
detection may not be 100% at the moment, as I lack a new SBK device myself to test against. but SHOULD work.
Thanks to RaYmAn for discovering how to detect the difference between the two devices.