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In order to get past the adhesive holding down the screen and into devices such as the iPad 4 and iPad mini without breaking the screen, iFixit have had to become creative.
One new device they use to get past the glue is called the iOpener. This is a device that is heated in a microwave, and used to melt the adhesive -- a process that can take up to 30 minutes.
Image source: iFixit.