There are lot of videos in this link. Opening and closing an electric or hydraulic hardtop is always going to be difficult because they are so heavy. I had a friend with and Xi5 and he had the soft top / hard top option and he had pulleys and a winch to lower the hardtop because it was only just manageable for 2 people to lift.
The best plan is to get it fixed for automatic operation.
https://www.google.com/search?q=2010+bmw+328i+hardtop+open+manually
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