If the rear glass is cracked, the suction handle may not stick. Try lifting it with strong tape, or superglue the suction handle in place and allow it to cure so you can proceed.

The surface of the rear glass is not completely smooth. For a better grip of the suction handle, apply tape to the rear glass or moisten the suction handle.

Secure a suction handle to the right edge of the rear glass, as close to the edge as possible.