I didn't find any notes on a changelog, but this new version is 1mb larger than the previous one, so I'm guessing there are some significant improvements. If you happen to notice what's new, let us know in the comments below!
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There are some ways to backup android phone contacts.
Sync to gmail is a common way.
Take a look at this article: KB13003-"JVM 513" error appears on the BlackBerry smartphone
You can also try: KB02141-Reset a BlackBerry