Samsung Galaxy S8 Disassembly & Assembly Manual page 16

Disassembly - Back Glass (3/8)
3) Fix the device on the OCTA disassembly holder.
4) Align 2 absorbers(OCTA disassembly upper)along with the back glass edge.
※ Left side of the back glass must be detached firstly.
Please keep the direction of device on the disassembly holder.
[ Note ]
Using OCTA disassembly upper is mandatory to prevent window crack,
except for using the automatic OCTA disassembler.
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