I've tried pressing the button (vent mode) for as long as a minute and nothing. I've also changed the fuse and nothing.
From what I can tell, you can't close the sunshade by manually operating the motor.

Is there anything I can do?

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E38 740i (9/94, GF61, JPN: M60B40, ZF 5HP30, 3.15:1)
E53 X5 4.4i (5/06, FB53, US: N62B44, ZF GA6HP26Z, 3.46:1)