To go back to DI18 just perform step 5 and then step 1 and 2 from
this post. I already posted how to get back to DI18, above in 4th post of this thread. That was part of how to get a working DK28. You could use the XDA link in the second post and it will receive the updates. But, you are better off flashing the one I linked you to. It is stock DI18. After you flash, you will lose root and be right back to stock, as if you just bought the phone with DI18 already loaded. If you don't know how to use clockwork, please just do some searching. All of this has been covered many many many times in this forum, xda and ppcgeeks.