How work dynamic dropdown into repeat area?

Hi everybody,
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I have a problem, i dont know how work correctly dropdown into repeat area.
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I was being guided by the dynamic dropdown demo.However I was not able to make it work.
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I have this..
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A repeat area with multi field area and two dropdown.
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Setting the Repeater Area

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Setting the firts dropdown
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Setting second dropdown

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Here i think is the problem...
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Setting DYNAMIC DROPDOWN
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I really have no idea how to go through with this. Can you help me please?

Hi oskar,
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How about this video:
https://www.youtube.com/watch?v=oTjb9mBxgco&list=PLNdPw6Bog3zcuSKs7NGNi8QPtfj5IsxQA&index=13
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You should try to use v7 for this!

It's not what I need, it's not going to work for me.

First I don't use read db, I use the options field in the drop down menu.

Second in the video no repetition area is used, it is different from what I need.
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😢😢😢😢😢