Schritt 3 übersetzen
Use spudger (black tool) to remove black plastic back of the device. Take care when removing the back of the device. The plastic tabs under the back are fragile and may break while prying with the spudger.
Take care not lose the lock/unlock switch as it is freed from the back of the device. (This is the same switch you used to open the battery door in step 1; it's marked in pink in the second photo).