Removing the rear glass panel from your Galaxy S6 destroys the adhesive holding it in place. Follow this guide to replace the adhesive tape on your Galaxy S6's rear glass. Most adhesive strips will come packaged as shown, although the film dimensions and color may vary.
Before beginning, we recommend you remove any residual adhesive from the glass panel using a q-tip and solvent such as isopropyl alcohol.
Conclusion
To reassemble your device, follow these instructions in reverse order. When reinstalling the rear glass, refer to the [https://www.ifixit.com/Guide/Samsung+Galaxy+S6+Rear+Glass+Adhesive+Replacement/44897|rear glass adhesive replacement guide.]