Looks like OS 6 and OS 7 devices are compatible, so get updated or installed and leave us a comment on how these free versions work for you!
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Take a look at this article: KB13003-"JVM 513" error appears on the BlackBerry smartphone
You can also try: KB02141-Reset a BlackBerry
Apparently, your os is corrupted somehow. Reload your os with BlackBerry desktop Manager (create a backup first, although I suggest doing a completelyHarmeling68 07-27-2014, 10:50 AM