I understand that the 7613 boot's in order from 1 to the last ios loaded on the disk, my challenge is to change from number 4 to number 1. I have downloaded the ios but it's on number 4 and i have deleted the ios that was on top(number 1) , now I want to push my ios from number 4 to be the first (number 1) ios on the list, how do I accomplish that?