Removing in ceiling polk speaker

I have to remove an in ceiling speaker to access the ceiling and clear path to route another cable. I have removed the outer grille cover of the speaker. I have removed all the screw completely of the speaker (Not sure if this was a mistake). The speaker is not budging. My guess is the rotating cam which holds the speaker against the drywall did not turn when I loosened and turned the screws . Any idea what I need to do to get the speaker out? Much appreciate any help.

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