Samsung S20 ultra back glass repair start to finish

How to change a Samsung Galaxy s20 back glass screen repair. Uncut full video start to finish.
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[@jamesstafford3652]

What adhesive are you using?

[@MM-oh3zs]

is it waterproof ?

[@jmackinjersey1]

I don't understand why you took it off and then put the same one back on. Anyway, my real question is this,... I have a Note 20 Ultra, and the back glass has been cracked for a long time now. Anyway, this evening I stopped at a local repair shop. He said something like $50, but that he didn't have any white covers, like mine is. He showed me three he did have. Upon inspecting them, I noticed that 2 were plastic and were not even glossy plastic. The black one was glossy, but still felt plasticy. Also, none of them had SAMSUNG written on them. He said that actually was glass. He said he could order me a white one. I said I'll leave. So, how does one go about ordering a back glass that is actually glass? Can anyone order an OEM part?