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The torx screw locks down a tabbed slide. Once it is completely loosened, pull up on the slide and it should pop up about a 1/4”. One it pops up, the Garmin will tilt forward and come out.
These old “brick” style were notorious for the screens going dark and appearing not to work. I sent mine back to Garmin twice to have them replace the screen. Last time, they said they won’t repair anymore, so I went with a newer style. Even it’s outdated now and I just use my phone.