While the iOpener tool kit may be the best solution for some applications it is decidedly NOT the optimal tool for removing and replacing a badly cracked Samsung S7 back. The iOpener was simply unable to get the adhesive hot enough to get it to release. Also, the cracked back did not provide enough uninterrupted surface for the suction cap to maintain enough suction to lift the back after I heated it with a heat gun. Overall an EXTREMELY frustrating experience. I do not fault iFixit for this but there could be a little more nuanced explanation about which applications are the best fit for the kit. Mostly I’d like to send a big effuuu to Samsung and all the other smart phone manufacturers who are systematically locking end user out of their purchases. Setting aside the sealed backs it’s absurd that we spend $700 on a smart phone and then have to spend another $40-60 for a protective case and a screen protector. The is no other consumer good we would put up with this.