Read the OP again. Look for "black screen" and you will find your answer.
Read the last 5-6 pages or so and almost everything has been addressed. The beginning of this thread was for DN3, and just added DN4 later instead of starting a new thread, so all the beginning stuff is obsolete except for the OP.
Download the ROM from the OP, and follow all instructions from there exactly. The last one I uploaded was the DN4 slim version. This was especially for the t889 T-Mobile version, since it has the smallest /system partition, and that's what I have too.
If you have problems with call counter, there is a fix in the download section, where you can see at the top of every page in this thread. You will also see a short code fix there too... so you have to choose whether you want either the call timer to work, or have short codes work. It's either one or the other, not both... your choice. You will need to use browser and desktop view to see it... you won't see it from xda labs or mobile view on your phone.
Once it is up and running, you'll need to take the OTA update. Once you flash the OTA update, you should see version 2.2.6 in the 'about phone' section. Just do an advanced search and use my user name and OTA and you will see quite a few results
Good luck :good: