The protective adhesive of the P40 Pro is very strong and hard to cut. It is likely that you have to reapply the iOpener after each of the following steps to soften the adhesive enough to cut it.

A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the device.

Since the rear camera module sticks out of the midframe, we recommend placing a lint free cloth or similar underneath the camera module during the following steps in order to avoid damaging the lenses.