NOT ABLE TO BOOT 8520 SHOWING ERROR 200

This error code is usually caused by a 3rd party application being downloaded on the phone. Below are the directions that may solve your problem.

What you will need:

A Windows PC (Only tested with Windows XP so Unix and Mac users may need other methods)

Javaloader (Get it Here: http://www.enduserguides.com/mobile/blackberry/eug_bbjavaloader.html

BB Device (this is your actual device)

USB cable to connect to computer

How do I save myself some time:
Download and extract the Javaloader program to a folder of your choosing but remember it for the next steps.

In Windows XP click Start -> Run -> Type CMD and click OK

change your directory to the drive and directory you saved the javaloader program to
(to change drive type x: where x is the drive letter, to change directory type cd\<directoryname>\<subdirectoryname> etc)

Type "javaloader -usb dir >dir.txt" without the quotes (this will generate a list of all programs on your device into a file called dir.txt in the same directory as Javaloader)

Go to the directory with javaloader.exe in Windows Explorer and open the dir.txt file.

The file has a list of a bunch of module names and versions, etc. This is where I can't give you the specific answer to your problem but can provide some guidance.

I only recommend trying to delete 3rd Party applications so look through the list for module names that look like third party apps. You can also sometimes tell 3rd party apps by the version number as well but don't use this as the bible because some RIM apps are not the version of the OS. Once you find some apps you want to try to delete to fix the problem follow the steps below. I recommend you do this one at a time and reset (if the device doesn't automatically reset) between each erase function to narrow down the issue.

Once you find the module to delete go back to the CMD window and type the following:

"javaLoader.exe -usb erase -f <badmodule_name>" where <badmodule_name> is the module you identified to delete which must be typed exactly as it appears in the dir.txt file.

Keep repeating until it reboots successfully.

If this fails you'll need to - or have a repair facility - wipe and reload your phone's operating system.