Sadly, you followed an inadequate, careless tutorial, and you couldn't have known that the tutorial was junk. That tutorial does not take care of warning about the pitfalls of newer hardware revisions...
TI-Planet's tutorial (
viewtopic.php?f=76&t=13213&lang=en ) avoids that blunder, but we have no control over the dangerous content that gets posted elsewhere...
You have successfully flashed an improper version of the boot2 onto your calculator, and it's now in need of repair through special (if cheap) equipment... See the very recent
http://www.cemetech.net/forum/viewtopic.php?t=10663 topic: you need to apply the same procedure for fixing your calculator.