Blackberry 8310 8320 8330 Curve 8100 8110 8120 8130 Pearl Car Charger / Veh: my 8250 keeps saying app error 523...

1) Make sure you have Blackberry Desktop Manager installed.
http://na.blackberry.com/eng/services/desktop/
2) On your PC, go to Start > Run and copy and paste the following line exactly (meaning with the quotation marks):

"c:\program files\common files\research in motion\apploader\loader.exe" /nojvm

3) The Application Loader Wizard will appear -- click "Next."
4) In the "Connection:" drop-down menu, you should see "USB-PIN: UNKNOWN". Click the "Next" button.
5) You should then see a list of applications ready to be installed for your Blackberry. Hit Next and Finish and you are well on your way to getting your Blackberry back to life. Congrats! Just don't disconnect anything and let the lengthy process finish completely.

NOTE: If you do not see a list of applications mentioned in step 5 and instead see the message "The Blackberry Desktop Software does not have Blackberry Device Software for the device that you have connected to the computer. Contact your wireless service provider or system administrator," then you must download Blackberry's Operating System for your carrier and device.
http://www.blackberryfaq.com/index.php/BlackBerry_Operating_System_Downloads
Just select the appropriate carrier and network type, select your Blackberry model from the list and download the latest version. Install this download and follow the above steps again and you should be on the right path.


Additional information:
http://www.blackberry.com/btsc/KB24395 "Error 523", "App Error 523", or "JVM 523" appears on the BlackBerry smartphone

Article ID: http://www.blackberry.com/btsc/KB10144
KB10144 How to force the detection of the BlackBerry smartphone using Application Loader

I got that from: http://supportforums.blackberry.com/t5/BlackBerry-Curve/App-error-523-reset/td-p/1743575

You may need to restore the phones firmware with the Desktop Manager software on your Mac or PC.

You need to reinstall the OS and the phone should work again.

Reinstall the phones OS. It will work after that.

You need to reinstall the operating system using Blackberry Desktop Manager from your computer.

Take the battery out and put it back in after 30 seconds or so. While the device is rebooting (or while the hourglass is still spinning), .plug it into the PC Then open the application loader and remove the 3rd-party application that's causing the issue

Your Blackberry probably just needs a firmware restore. Here's a guide on how to restore the blackberry firmware, the website is at : Restore Blackberry to factory settings.Download the Blackberry Desktop manager and run the application loader. Make sure you check to delete old applications in advanced tab. Carefully all you datat will be wiped.

you will need to reload the operating system using desktop manager.

Your Blackberry probably just needs a firmware restore. Here's a guide on how to restore the blackberry firmware, the website is at : Restore Blackberry

On the BlackBerry smartphone, the following error message appears after pressing the mute button, accessing an application, or performing a hard reset:
523 app. error. Reset.

To resolve this issue, the BlackBerry Device software will have to be reloaded.

Note: The BlackBerry smartphone will not show a Connected state in the BlackBerry Desktop Manager. Please proceed to open and run the Application Loader.