A way to skip step 17-22
I unfolded as next step the display in a perpendicular way (so display unit and rest of the device in 90°) and fixed the display with an elastic band at an opened iPhone packaging box. Then I continued directly at step 23 with the removal of the battery without removing the display unit at all. Worked very well without any problems… and now I’m curious whether the new battery really powers the device for a longer time :-)
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