One of the most common errors that you will see on a BlackBerry smartphone is an app or jvm error, both of which deals with a java type error. App error 523 or JVM 523 is a common issue dealing with a hiccup in the java processes of the BlackBerry. When errors like this occur it can be for many reasons including incompatible apps, app crashes, exceptions thrown by currently running apps, and over-the-air updates done to the OS or different applications. These can be anywhere from a constant pain in the butt to a devastating error that will cause you to lose all of your data.
So how do you fix this error?
Well the bad news is that most of the time there is no “Fix” for it unless you know what is causing the specific error to come up. This can be done by keeping on eye on the apps you use or open when the error happens or other events that happen on the BlackBerry that will display this error. If you call BlackBerry Tech support they will gather logs from your phone and will review it to see what’s causing the error but most of the time the only things that can be done are a couple of work arounds.
Word-Around 1: This is the easiest of the two and the one that you hope fixes this error for good or at least long enough for you to get a backup done to save all of your information on the BlackBerry.
Work-Around 2: Should the hard reset (previous step) fail and you are unable to access the BlackBerry, you will unfortunately have to reload the BlackBerry OS back on the phone. This can be done either through the BlackBerry Desktop Software or through the BlackBerry Apploader. In my experience with this error and reloading the BlackBerry OS it is much more effective and simpler to use the AppLoader to reload your software. You can learn how to do that here – How to Reload BlackBerry OS with AppLoader.
At this point in time these are the only 2 workarounds that will work to resolve this issue. So what I would suggest you take away from this is to make sure you are making backups of your BlackBerry on a regular basis and that you stick to downloading only apps that are meant for your BlackBerry.