Refer to this guide on how to do a back glass replacement on the S7:
[guide|107714]
I use guitar picks, suction cup to lift up a corner of glass a bit after heating the adhesive then go around the adhesive with the guitar pick to lift the glass up safely.
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I think the key is to get the guitar pick under the whole adhesive if possible as it gives the best result when prying the back glass off.
Refer to this guide on how to do a back glass replacement on the S7:
[guide|107714]
I use guitar picks, suction cup to lift up a corner of glass a bit after heating the adhesive then go around the adhesive with the guitar pick to lift the glass up safely.