1. Please use your nail to carefully lift the side of the protectors from the camera lenses.
2. Take care to lift a corner with your nail first, so that the lens film can be easily removed.
If the glue sticks tightly. You can try a few more times.
3. If you still can't take it off, you can try to lift it up with a sharp object. Be careful not to let sharp objects hurt you or scratch your phone.
As the video shown, you can use the hair dryer to heat for a few seconds, but remember that use one level or two which not too hot to hurt your phone. Keep to heat for a while and then try to use your fingertip lift the side of the protectors from the camera lenses.
If the glue sticks tightly. You can try to heat a few more times.