GM (Golden Master) = RTM (Release To Manufacturing) = the point where it becomes a bit of a hassle to do a recall because you&#x27;ve started putting copies of your OS in boxes somehow (whether pressed on a disc, or flashed to new machines&#x27; SSDs, or whatever.)<p>If Apple does a second GM on a product, they&#x27;re likely &quot;rewinding&quot; their pipeline, reopening sealed boxes to re-image computers. Not something they will do if they can at all help it!