Use the spudger to detach the green flat-top connector located under the rear camera. Slowly push the connector up and back. Refer to the first and second images.

Use the spudger to detach and lift the orange flat-top connector seen in the second image. Slowly push the connector up and back.

Then, detach the remaining three flat-top connectors one at a time to release the motherboard from the housing. The third connector is hidden underneath the largest one.