In this video you will see the bow latch cylinder and the 6mm wrench necessary to release the tonneau.... you will see that guy easily turns the 6mm screw ...
this occurs at :15
In my case ...the 6mm screw did not readily turn in the direction indicated (or any other direction)

it is locked tightly ... I cannot raise the tonneau ... hopefully I am missing something so glaringly simple

here's the video link https://www.youcanic.com/video/0105181075635972