I do not know exactly what /nojvm does, but it helped me often to fix BBs with 2 flashes - 2 second pause - 2 flashes. Another trick you could try is:
Close Desktop Manager
Start loader.exe from C:\Program Files\Common Files\Research In Motion\AppLoader\
Click on "Next"
Reset the BB using the rest hole under the battery door
Connect the BB while the red led is turned on (you have to be very quick when doing this)
When you see "Connection: USB:UNKNOWN" click "Next"
The loader should connect to your BB and you can update the firmware
If the process fails at the first try, repeat it. If you are not used to this procedure it can take some trys to find the right timing.
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