Setup is very error prone. I have successfully installed glass screen protectors on several phones in my house, but always with the included installation guide/alignment bezel. Unfortunately, my first attempt at this item for my new Galaxy Tab s7 11 was to do it with my bare hands and over time I went through a few rounds of space and lifting to better align (particularly the camera cutout and edge alignment). Bubbles caused by dust left some dust bubbles and corners/edges that didn't stick enough to get rid of the bubbles or edge defects. So I started over with a second screen, after carefully cleaning the screen with a cleaning kit (not only supplied), but this time with surgical gloves. Same problem with alignment and multiple placement. Although the gloves had reduced the gap areas between the edges and corners, they were still a pair and the alignment was far from perfect. Will be replaced by one with an alignment guide.
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