You will also need several picks to unstick the back cover all around. Heat the spot where you start and place a flat tool between the back cover and the frame. Once the tool is inserted, stick a pick into the gap to keep it open. Then run the tool around the entire edge to gradually loosen the glue. https://www.idoc.eu/guides/en/samsung/galaxy-a7/replacing-the-back-cover/710
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You will also need several picks to unstick the back cover all around. Heat the spot where you start and place a flat tool between the back cover and the frame. Once the tool is inserted, stick a pick into the gap to keep it open. Then run the tool around the entire edge to gradually loosen the glue.
https://www.idoc.eu/guides/en/samsung/galaxy-a7/replacing-the-back-cover/710