That's what I got to thinking, Hboot 1.58 is needed to run the 2.89 ruu isn't it?
DS
Nope!! You can run the 2.89 RUU which will update you to hboot 1.58. You just can't go backward unless you are s-off. So if you do it, you'll be stuck with 1.58 until you are s-off.