Thank you very much. Its good that it work slike that : Push the SF40 button as a second check. This worked, but I have to look further at the timing. When do I have to push the SF40 button in this sequence exactly. I'm still finding this out. But it worked after a fwe tries. Update after I read the message of M_Mohann. You must push the SF40 Firmly ! With my soft fingertips it sometimes didn't notice that I pushed it. So beware of that, or take a solid part to push it.
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