First of all we must extract the ten Allen screws (1.3) that are located on the sides of the phone.

Once the screws are removed, we can unhook the back cover.

Remove the three Torx screws (T4) that hold the shield and the upper antenna, and we can unhook them.

Removing only the metal shield would be enough.

We disconnect the flex from the battery, we lift the adhesives that surround it, and with a sufficiently fine tool we will take it off taking care not to damage the flex of interconnection that is below.