For me it has ALWAYS worked to go to my dealer and just make up a story about crahing here, wierd text characters there, bla bla. Just make something up that sounds reasonable enough and tell them it is something that just happens out of nowhere and is not reproducable. Usually they will take that an upgrade for you.
If not, what has also worked for me, is pay for the upgrade. It was only 80 bucks in my case.
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