LG G7 ThinQ Back Glass Cover Replacement In Depth Tutorial

This is an in depth LG G7 ThinQ smartphone back glass cover step by step in depth replacement tutorial. See links below to get the back glass cover and the adhesive used for this repair.
Back glass cover: ebay.us/DFbyNE
Adhesive: ebay.us/q40R1K

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What was that insert that came with the new back cover? Does it have a purpose?

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존나게 잘하노 ㅋ