Screen keeps going white and giving me a 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

i have 8520 and i cant get rid of app 523 error

i security wiped my user installed apps and it keeps bringing me to the screen that says app error 523 and wont let me do anything but keep rebooting the phone. i need to get into my phone to get all my contacts and i cant get past the screen

OK. First start off with the battery out of the phone and the usb cable unplugged. Next open the Desktop Manager, then go into Application Loader. When you get to the part where it asks for the connection type just plug in the usb cable (still leaving the battery out). If the connection changes to usb<pin> or usb<unknown>, hit Next. Keep going through the wizard till you're on the last step, before you hit Install. Now put the battery in and see if the loading operation completes.


App Error 523 usually happens after loading incompatible 3rd party software. Did you load anything lately? You should be able to connect to the device while it's rebooting (spinning hourglass) with application loader and remove the offending 3rd party application.

Try to reload the OS...will probably fix it.

try a factory reset:

How to reset BlackBerry Curve 8520 to factory settings: Press the BlackBerry key, Go To Options > Security Options > General Settings > Menu > Wipe Handheld > Scroll to Continue, press the Trackpad. it will reset your BlackBerry 8520 quickly.

Your operating system needs to be reloaded.

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

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.