For the people that are experiencing issues rooting with other methods.  I can assure you this method is almost guaranteed to work for you and easily root your Sony Xperia iON.  When all other methods failed, this one worked for me.    This method is a 1 click root.

  1. Install the latest device drivers from the Sony support site, only try this step in case you have never connected the phone to the PC before.
  2. Download the ERoot exploit here (mirror) and extract it into your Windows PC / Laptop.
  3. Enable USB Debugging and Unknown source in main Settings.
  4. Run “ERoot-1.0.14.exe”, don’t be shocked if you only read Chinese letters. Then connect your phone to the PC.

xperia ion root easy