Here is why I posted this.
My wife wanted her phone back to stock. So I searched around for about an hour looking at all the different ways to unroot. I finally chose the way I wanted to do it using the PG06IMG. After running it the phone was S-ON and Root Checker was still saying phone was rooted with busybox and the custom ROM was still installed. I was still able to get into recovery but wasn't able to get s-off again. So I tried to install the the lasted stock ROM via CWM but it caused the phone to get stuck at the splash screen (prolly because of S-ON). After about 5 hours of searching (I did find posts to do what I ended up doing but they weren't detailed and I couldn't figure out why it wasn't working) and piecing things together I finally found a solution that worked. Hope this helps you.
Blackberry Torch 9810
ASUS Transformer EEE PAD TF300T
Unlocked Bootloader and Rooted