1. Download and install Jl_Cmder to your PC
2. Make sure ALL your data (i.e. contacts, appointments, memos and etc) are backed up or synced before proceeding! This will wipe everything off of the device
3. Make sure you have the latest version of both Desktop Manager and the Handheld OS installed on your PC. If you need them then download them from here
4. From the PC navigate to c:\program files\common files\research in motion\apploader and delete the file vendor.xml
If you have never installed the Handheld OS before then the vendor.xml file will not be on the PC and you can skip this step
5. Plug the device into the PC using the USB cord and make sure Desktop Manager is closed
6. Remove the battery from the device
Wipe The Device
1. Wipe the device using Jl_Cmder
This may take several attempts to connect to the device, so keep trying until it connects and wipes
2. The device will reboot to a white screen with a '507' error
Install OS and Restore
1. Open Desktop Manager and select Application Loader
2. Install the OS by following the prompts and selections
3. The device will reboot. It can take up to 15 minutes for the 1st boot.
4. Restore the previously made backup or re-sync
5. Install the battery back into the device and unplug from the PC
Image
copied from www.blackberryfaq.com
