Samsung SM-G996B Repair Manual page 86

7
Remove all release films on back cover.
Before attaching the back cover, make sure that there are no screws,
miscellaneous parts, or other foreign objects on the inside of the device (among
the battery, PBA, etc.).
8
Remove transparent bottom release film underneath the black adhesive tape of
microphone hole tape.
Attach the new microphone hole tape by using the tape's L-shaped cutout to guide
you during the installation.
Gently press down on the edges of the adhesive tapes.
Disassembly and Assembly
86