You're going to have to do the upgrade without using DM. You will need to follow the instructions on what do do if JL Commander doesn't work. Also, make sure you have your USB cable connected directly to your computer and not through a hub.
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It's all in the instructions which is why we're saying there is nothing else anyone can do than that we already have done. We've pointed you in the right direction, and you need to follow all of the instructions.
I went through the same thing when I was new to BlackBerry, and I was directed to this page and I was able to fix my phone.