Opening the Samsung Galaxy A5 will damage its waterproof sealing.
Power off your phone before disassembling it.
Alternatively, use a hair dryer, heat gun, or hot plate – but avoid overheating:
Insert an opening pick at the bottom end of your phone.
Use a opening pick to carefully pry the adhesive from all sides of the phone.
Be aware that the back cover is under constant tension and may break if the adhesive isn't sufficiently loosened.
Ensure all existing adhesive is removed before reapplying new adhesive.
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