So, I just successfully downgraded my new 3ds xl to 9.2.20U, wanting to install custom firmware on my device. I've been following the various guides posted on this site, however I'm a little lost as to what I should go for in terms of choosing a custom firmware. I don't know what NAND or EMUNAND means, but I keep hearing it's important. I still have all my eshop content on my 3ds, and I've heard that it is easy to lose them if I don't back them up? I just want to have a way to access all my purchased content and play online while still being on custom firmware with the ability to run unsigned cia's. what are my options?