after trying to review some of the information on this process, it seems as if after you do this, you will never be able to go back to a lower firmware. The site that was listed says to install only rebug 4.21.1. It has a source link that when you click it, it says to only install e3 4.30 cfw. Not sure how to make heads or tails, but i dont really like that i would never be able to go back to a lower firmware, because i would like to remarry a drive to this console, assuming i dont kill it trying this crazyness
