Possibly with custom hardware. Cartridges are essentially glorified SD cards. However, they would need a dump of the decryption key, which is not possible to obtain yet. This is most likely fake.
Two ways: undisclosed software exploit, or decapping and using an electron microscope. The former would be a world first as AFAIK no hacking group has claimed to be able to do that yet, and the latter is very expensive and extremely hard.