- Download the OS you want for your device
See: OS Downloads - Make sure you have Desktop manager (aka DM) installed. Having the latest version is usually good.
- Delete any newer OS if any via “add or remove programs” in the control panel.
- Install The OS desired
- Delete the vendor.xml file.
It can be found in:
C:/ProgramFilesCommonFilesResearchInMotionApploader
OR
C:ProgramFiles(*86)/CommonFilesResearchInMotionApploader - Delete the second vendor.xml file
C:\Users\<user>\AppData\Roaming\Research In Motion\BlackBerry\Loader XML
OR
C:\Documents and Settings\<user>\Application Data\Research In Motion\BlackBerry\Loader XML
Note: device.xml should remain inside - in the above folder, launch “loader.exe” after connecting your device. Follow on screen prompts. Always make sure “third party apps is checked” to keep your current applications.
ALWAYS CHECK THROUGH THE LIST BEFORE PROCEEDING OR RISK DATA LOSS!
Do read the TIPS nonetheless before proceeding.
If something went wrong with the downgrade, Simply follow the steps mentioned above if, for any reason, the App Loader is not detecting your BlackBerry. Take out the battery and connect the BlackBerry via USB. Launch App Loader and wait for it to detect the BlackBerry. Sometimes it will display your PIN or say the device is unknown. This will allow you to get to the step in which you choose what apps and settings you want to install on your BlackBerry. Carefully place the battery back in the BlackBerry without unplugging it from the USB port. If fails, consult experts immediately. (Don’t try loading more than twice)
If you’re on a BlackBerry Enterprise Server (BES) you should check in with an IT representative before attempting to downgrade your smartphone’s handheld software, because some IT policies can block or partially block a new OS install.
