In case anyone has the same issue –
A few months ago I purchased a SamsungBD-F6500 from Noel Leemings (A whiteware retailer in New Zealand). A few days ago, we purchased some DVDs which were “region 2” and would not play on our NZ/AU – region 4 player(s).
I attempted to region unlock the DVD using the method on the Internet, ie Start the DVD player, open and close [empty] dvd drive, press repeat, enter in “7 6 8 8 4“, then “9” for region free. This failed to work a number of times.
With nothing to loose I upgraded the firmware to 1017, and was able to unlock the drive using the above process without issue on the first attempt.
(Of-course, friends who download their content using filesharing networks don’t have these issues – and the media industry wonder why movie piracy is so common ?)