[clb239]

I upgraded my MM 8830 on Verizon from 4.2 to Sprint's 4.5

Now I need to downgrade it back to 4.2

I uninstalled 4.5 from my PC and installed 4.2...then I connected my BB and ran both apploader and desktop manager but neither downgrades the OS it only offers the ability to uninstall 3rd party apps...

My question is how do I downgrade my OS and return the BB to the same state it was when I received it new...

clb239

[JoeyMoose]

1. Delete the newer OS from your PC by going to Control Panel >Add/Remove Programs.

2. Then download and install the older version of the OS. BlackBerry Operating System Downloads

3. Then locate and delete the file named "vendor.xml"

4. When that's done, simply plug in your device, open Desktop Manager and run Application
Loader. The loader will downgrade the OS.

[JoeyMoose]

1. Download the version of OS you want to install from your carrier's website.
2. Extract or install the files from the previous step. They will automatically install into the correct location. This location will be C:\Program Files\Common Files\Research in Motion\Shared\Loader Files. Under this directory you will see directories with the model number of your device (if you installed the correct files) followed by a version number. Under these directories will be a host of .alx and .cod files. Do not modify or delete these files. They are needed to install the new OS.
3. Assume the BlackBerry Handheld Manager is installed, when you plug your device in, a popup will appear and ask if you want to upgrade your device. Choose upgrade and follow the steps given by the Application Loader. If you have any 3rd party applications you would like to keep, locate and select them at this time to avoid having to reload them after the new OS is installed.
4. This will also be the time the apploader will ask if you want to erase all data and reload or backup and restore the data on your device. Choose your preference and continue.
5. Typically a complete OS reload with backup and restore can take anywhere from 5-15 minutes depending on the amount of data on your device to restore.
6. The apploader will inform you when the process is complete. After this, the device will automatically reset itself (sometime this will take longer than a normal reboot) and once completed and on, your device will be upgraded and ready to go.

Now if you wish to downgrade your device to a previous version, many of the above steps will apply.

First, you will have to remove the newer OS from your PC. Do this by going to add/remove programs in the control panel and removing the software for the new BB OS. Make sure desktop manager is not running when you do this. After complete, restart the Desktop Manager.

When you plug in your device, if everything went well, the Desktop Manager should tell you that your PC has an older version of desktop tools than is installed on the device. It will give you an option to keep the version on your BlackBerry or downgrade to the version on your PC. You will want to select downgrade and let apploader do the work.

Should this method fail, you will have to download the file javaloader.exe from the internet. Place it in a common directory (I usually put mine in the Loader Files directory for easy access. From the directory you have javaloader.exe installed in type "javaloader -usb wipe". This will completely erase all data and applications from your devie. Now navigate to C:\Program Files\Common Files\Research in Motion\AppLoader and delete the file vendor.xml. Now plug in your device and install the new OS from scratch. Open apploader and select the USB port as your connection. It will then bring to you to the main apploader screen and all the OS packages will be listed with status as Install.

[clive48]

Hi

Is ur problem solved?
I also did a reversal from 4.5 to 4.2 & had no issues.
However pl make double sure thatur address book 7 claender is backed as I foudn that 4.5 doesn't back these proeprly. Luckily I had used 4.5 for a week so didn;tloost much address data but loosing my calennder was a mess.

[clb239]

Problem has not been resolved...after running javaloader bberry is completly bricked...i've tried dm 4.5 and 4.7...os 4.2 and 4.5...

whenever i open apploader all it says is...

" The BlackBerry Desktop Software does not have BlackBerry Devide Software for the device you have connected to the computer. "

Any suggestions...

I am using sprints 4.5 and 4.2 os's for the 8830 WE...

also - i am getting 507 error code on the bb screen...

clb239