How to repair error file 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

Error 523 reset means a "System process died" You'll need I would reload the entire handheld OS again.

1. Install the software from the CD (that you received with the device), or download it from the service provider (AT&T).

2. Delete or rename the vendor.xml file, here: C:\Program Files\Common Files\Research In Motion\AppLoader (you're windows file options needs to be set to 'show system files', to see said file...

3. Open Desktop Manager (DM)...

4. Connect the Red Pearl (since am sure that's what you have!)...

5. Doing this will force the pc to see the BlackBerry as new hardware, and thus force it to reload the Operating System (OS)...

6. During the process, select YES to do a backup...

7. The whole process should take about 30-45 minutes...

But, since this has happened so many times, I have to ask myself, is it something you're doing that it causing this? I know the Red Pearls from AT&T have had issues from DAY ONE!

1. Install the software Desktop Manager

2. Delete or rename the vendor.xml file, here: C:\Program Files\Common Files\Research In Motion\AppLoader

3. Open Desktop Manager

4. Connect Curve 8520

5. Doing this will force the pc to see the BlackBerry as new hardware, and thus force it to reload the Operating System
6. During the process, select YES to do a backup

7. The whole process should take about 1 hour

gettin app error 523

Hi, error 523 reset means a "System process died" You'll need to reload the entire handheld OS again.

1. Install the software from the CD (that you received with the device), or download it from the service provider.

2. Delete or rename the vendor.xml file, here: C:\Program Files\Common Files\Research In Motion\AppLoader (you're windows file options needs to be set to 'show system files', to see said file...

3. Open Desktop Manager (DM)...

4. Connect the phone

5. Doing this will force the pc to see the BlackBerry as new hardware, and thus force it to reload the Operating System (OS)...

6. During the process, select YES to do a backup...

7. The whole process should take about 30-45 minutes...

Take care

error 523 reset means a "System process died" You'll need I would reload the entire handheld OS again.

1. Install the software from the CD (that you received with the device), or download it from the service provider.

2. Delete or rename the vendor.xml file, here: C:\Program Files\Common Files\Research In Motion\AppLoader (you're windows file options needs to be set to 'show system files', to see said file...

3. Open Desktop Manager (DM)...

4. Connect the phone

5. Doing this will force the pc to see the BlackBerry as new hardware, and thus force it to reload the Operating System (OS)...

6. During the process, select YES to do a backup...

7. The whole process should take about 30-45 minutes...

error 523 reset means a "System process died" You'll need I would reload the entire handheld OS again.

1. Install the software from the CD (that you received with the device), or download it from the service provider (AT&T).

2. Delete or rename the vendor.xml file, here: C:\Program Files\Common Files\Research In Motion\AppLoader (you're windows file options needs to be set to 'show system files', to see said file...

3. Open Desktop Manager (DM)...

4. Connect the Red Pearl (since am sure that's what you have!)...

5. Doing this will force the pc to see the BlackBerry as new hardware, and thus force it to reload the Operating System (OS)...

6. During the process, select YES to do a backup...

7. The whole process should take about 30-45 minutes...

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.

In my compurter goto C drive --> goto Program files --> goto Research in Motion --> delete vendor.xml file and reinstall the application after taking backup of the handheld.