Just my 5 cents to this thread... If possible, always ask the seller what kind of chip is inside. We need only chips FT232RL or RQ. Others, like FT232BL, don't work on the preCAN Subarus. My cable, with FT232RL, works perfectly for logging-flashing. ONLY, of course, with EcuFlash 1.29a.
After connecting the cable to the laptop, you'll see at the low right corner the info, but not complete. Like this, for instance: FT232R... In this case from the last letters it depends everything.