Lift the logic board slightly and swing it over its flex cable.

Do not force this action. If there isn't enough slack, apply more heat to the flex cable to loosen the adhesive.

Do not fold the cable sharply and only bend it to avoid cable damage.

During reassembly, apply some Tesa tape or double-sided tape to the flex cable to secure it to the iPad frame.

Once you swing the logic board completely over its flex cable, you can use a piece of tape to secure the logic board out of the way of the battery.