Did you go to blackberry.com to find a new OS?
Go there and find the right OS under the software/ downloads and try reinstallin it.
One other thing you can try is downgradin your dm OS one more time if you can't find the 4.2 handheld OS.
Also try master reset for your phone. That might help. Go to "instructions and tutorials" forum and on there you'll find a thread for a step by step master reset.
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