I too tried the suction cup - worthless on cracked an only pulled off the many layers of packing tape applied as suggested. Used edge of utility knife to pry it up, then helper placed another blade underneath until I could pry it open. Great suggestion I read elsewhere, and only way I could get cover off.
I too skipped step 25. Definitely requires patience! Screen replacement was successful, but noticeable degradation in screen clarity/color from the original is somewhat disappointing. At half the price of OEM repair, would probably do it again though.
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