I got a replacement STSe KSU from PC liquidations I told them it must be a 3.0 sw. I got 1.00 and the system has a DECT on it. I have some KSU that won't complete boot-up could I use a PMU that has 3.0 software from one of those?

We have these STSe KSU in stock. Call or PM

yes you can throw the PMU in it. Default it and load your back up database you'll be good to go