Started Simple Downloader Tool - Stuck on "Downloading...Do not turn off target!!"

[dm3ready]

Any help would be greatly appreciated. What happens if I restart my phone when it states: "Downloading...Do not turn off target!!"?

I was using Simple Downloader Tool to upgrade to Jelly Bean but the Simple Downloader won't even get to 1%...it states: Error Ocurred! Cancel Download!
I tried to use Kies and ran into download issues too.

***figured it out...no damage done. However, I can't understand why neither Kies or the Simple Downloader Tool will work - should be easy!!

 

[Jon Rock]

What did you do, because mine did the same thing after I accidentally DL'd Sprint's JB instead of Virgin Mobile! Now it says select recovery mode in Keis and try again, but it wont connect to Keis. WTH?

 

[dm3ready]

The only thing I could figure out was that my USB cable was faulty. It worked fine for charging my phone but not for data transfer. I wish I could offer more.