Given the task definition and input, reply with output. Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

What was the reason behind the conversion of human into USB in the movie Lucy? Why did the heroine change herself into USB when she used 100% of her mind, and then texted the policeman ("I am everywhere")? She traverses many old eras, and in the end just forms a strange structure, giving the researcher (scientist) USB and then that huge structure falls off?
Why did Lucy convert herself into a USB?