Only disadvantage to being on 4.1 and using SX OS is that you cannot use the eShop, update games, or play online. However, you risk getting banned doing all of these on 5.1 while using SX OS so you have to weigh your chances.
This may be a stupid question. But what are fuses and how do I go about burning them?
Its a form of downgrade protection where every few system updates or so, Nintendo literally burns a fuse in your Switch. When the console turns on, it compares the number of fuses burnt with the current firmware. If they don't match, it will not boot up. Also, fuses are a hardware modification so you cannot simply reverse this with any piece of software. Read more here: http://switchbrew.org/index.php?title=Fuses
It helps them to see more of the base code TX uses in their software which can be used in understanding how the licenses are generated, any holes in their firmware, etc. A good analogy would be a translating a book into a different language that you can understand. Now you can read it, but you won't know anything until you start reading.
You can download the OS with the above website, but remember that without a valid license or crack, you will be unable to launch game backups with it.
