Regarding the finger print scanner, it took me a couple of run throughs to realize this, but each section is in order, so just find the top section, then find the top section again in slot 2, then click right once, that will be the correct part of the finger print. Then on slot 3 find the top section again, then click right twice, and just carry on like that for the rest of finger print. I got guide lies from this blog https://www.gtaboom.com/gta-online-the-cayo-perico-heist-faq//
Does that make sense? It's quite hard to describe in a comment.