I had no luck with protective foils. This is usually because dust or small hairs get on the sticky side when the backing is removed. This was no exception and I saw 2 pieces of debris which I had to scrape off with my fingernail before sticking the screen protector onto the phone. Surprisingly, she's still stuck! Love the instruction stickers, they really helped. However, there was one bubble that didn't go away. So I carefully pulled back one of the corners to release the bubble and glued everything together and it looks great. It's a long story just to say that the installation process can handle a small amount of human error but still achieves a smooth finish :) .
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