Do not pull the frame away too quickly. The screen may be stuck to the frame, and pulling on it could cause damage. If the screen is still attached, lightly push on the screen with a finger and it should pop out.

Insert the spudger into the gap under the frame, and lightly slide it about 3/4 of the way down one of the long edges, then repeat with the other.

If the frame doesn't simply pop off, try sliding the spudger the rest of the way down the long edges, and lightly lift the frame with your fingers.

When re-assembling, make sure the frame's microphone hole is on the same side as the sensor board underneath.