It also depends on the age of the X850Pro. The older "batches", for the most part, all seemed to be unlockable. The newer ones though (sold in December and later) with a Serial number above 1805xx have had little to no success. The best thing would be to look on Ebay and ask the seller what Serial number the card is, then do a google search on it. For instance, I was looking into buying a x850Pro with a 180529 Serial number, which according to forums was successful at unlocking. (And just to verify this, someone else was selling an already unlocked x850Pro, which incidently, had a 180529 serial number). So, just do some research on the Serial number of the card before you buy it. If you can't acquire the Serial number, then at least try to purchase an older one.